There’s always a beginning to the story: something that draws one’s interest to a certain brand. Today’s #TBT relates to that beginning, for me at least, and highlights a popular watch in vintage circles outside of just those who admire the brand name on its dial. It’s a watch that has gained interest amongst fans of divers, military pieces, movie-related timepieces, and, most commonly, admirers of vintage Seikos. Today’s #TBT is about the vintage Seiko 6105-8110.

The Seiko 6105-8110 is the watch that drew me into vintage Seiko. I can’t quite remember how I stumbled upon it, but I can recall seeing it 4-5 years ago, looking at it on eBay and then moving on to something else. I had not really read enough about Seiko at that time and wasn’t compelled to spend decent money on what I considered to be a fairly pedestrian brand. Somehow, I kept running across the watch on various forums and I decided to start doing some reading. Ultimately, I decided that I wanted one in my collection and set about finding the right example. After a couple months, I located one on the SCWF from a seller in the Philippines (yes, good sellers do exist there) and I made the purchase. The watch then took its time getting through German customs (at least a month) before finally arriving on my desk. Needless to say, I was impressed.

The Seiko 6105 series replaced Seiko’s original professional diver, the 62MAS, in 1968 and was produced until 1977. In its first execution, it was produced with a clean, symmetrical case. About midway through its production cycle, it was replaced by the asymmetrical piece you see here. The case design is notable as it sets the tone for large, slab-like, case to be seen later on the beloved 6306/6309 series. Additionally, it represents Seiko’s first asymmetrical case, creating integrated crown guards that, stylistically, are seen up through today’s SKX007.

The Seiko 6105 comes in at an impressive 44mm in diameter and features a 17 jewel automatic running at 21,600 bph. It has a quick-set date does not hand-wind due to Seiko’s magic lever system. It claims a water resistance of 150 meters and has a bi-directional rotating click bezel. The crystal, as the scratches clearly show, is Seiko’s in-house Hardlex mineral glass. Lug width is 19mm. The crown, in lieu of a screw down method, uses a turn and lock system that is unique to this model; its functionality and longevity was clearly seen as questionable versus traditional screw down crowns. The case-back is screw down per the typical manner.

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Finishing on the Seiko 6105 is impressive and uses a matte finish on the top of the case and polishing on the sides. In fact, the case, overall, is impressive. From almost every angle, there’s a lot happening and it has an almost organic, amoebic, feel to it. It’s very 1970’s, but in a good way if that makes any sense. The dial is business-like with applied indices that are filled with lume. It contains minute markers outside of the indices that are mimicked in a chapter ring that slants up towards the crystal. It should be noted that this chapter ring, which was also found on the first execution 6105, is still present today in Seiko’s dive watches. Hands are extremely basic and well designed as rectangles with lume. The sweep seconds hand, though, is where it gets interesting. It’s a basic spear until the endpoint where it’s capped off with a unique shape and what was previously a red-filled dot followed by a dot filled with lume matching the rest of the dial. It’s a hallmark of the model that stands out whether the red has faded beyond recognition or not. One final note regarding the dial is its restraint when it comes to verbiage. Seiko placed its name on the dial using applied chrome and then printed “Automatic”, water resistance and the Suwa symbol in white. It’s a case of “less is more” and is simpler than the 62MAS before it. Finally, the classic Seiko bezel is updated from the 62MAS by introducing a triangle at 12:00. Here again, the same bezel is with us today and is great in its simplicity.

Regarding popular culture, the Seiko 6105 is famous for its presence in Apocalypse Now on the arm of Martin Sheen’s character, Captain Willard. The famous image is easily found by doing a simple search online. Related to this, though, is the fact that the 6105 was somewhat of a popular choice amongst soldiers during the Vietnam War. It was sold in military PX’s and while not cheap, it was certainly less expensive than, say, a Rolex Submariner.

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At 44mm in diameter, you’d expect the Seiko 6105 to wear like a behemoth on the wrist, but that simply isn’t the case. Perhaps it’s the soft shape or the slim lug width that helps, but it really wears much closer to 40mm. Speaking of those slim lugs and what lies between them, you’ll notice a rubber strap. However, this is no ordinary rubber strap but a waffle strap that was standard issue on watches such as this. In my opinion, this is the only strap that belongs on this watch. Of course, finding an original strap is problematic as they’re extremely rare, expensive and often damaged. Luckily, seller “wjean” on eBay has fantastic replicas for sale that fit the job. If you end up owning a 6105, I highly recommend buying one of these straps.

Finding a Seiko 6105 is not overly difficult, but finding a good one can be another story altogether. You’ll note from my example that the dial exhibits some characteristic “wabi” or lume rot characteristic of vintage Seikos. However, this example isn’t bad compared to many and it looks authentic compared to the vast majorities that have been refinished. This brings me to an important point; there are loads of 6105’s for sale and most of those have been altered. When it comes to alterations, they range from refinished hands and dials to parts replaced with aftermarket items. A tell-tale sign is the sweep seconds hand; if the colors are too poignant especially when compared to the rest of the dial and hands, something is wrong. You have to be very careful about buying a 6105 and ensure that you are getting something that meets your expectations. I’d generally say that perfect looking pieces are rare as most lived a hard life, but they do exist and are priced as such. Good, solid pieces have now appeared to eclipse the $1,000 mark and excellent pieces are hitting $1,500 and above. The market, at this time, seems to appreciate well-restored and refinished pieces, but, for better or worse, I am a stickler for originality. Another item to check for is crown to ensure it is the original stating “lock” with the rotating arrow. Bezel inserts are also often replaced with aftermarket inlays so do some homework on this as well.

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The Seiko 6105 is an iconic watch in the Seiko diver chronology. It has a great case shape paired with an equally fantastic dial design. It was the beginning of my journey down a path of collecting most of the Seiko divers and it still remains as one of my favorites and perhaps the most distinctive. Its appearance in a legendary movie doesn’t hurt either. Feel free to share your thoughts below on this week’s #TBT or on which Seiko diver got you hooked!

Michael Stockton

Michael Stockton

Contributor at Fratello Watches
Michael has worked in the Automotive Industry and is currently in the Electronics Industry. When he's not cruising at 30,000 feet, he calls Germany home. Michael became interested in watches at a young age through the influence of his father. His interests lie in a wide array of watches, but he has a real passion for vintage chronographs.
Michael Stockton
  • Bazil

    Interesting to see how this watch has developed into the SKX007. The case looks chunky yet comfortably curved and different. I’m also loving the crown guards. All in all, a very nice watch and would probably sell well in today’s market. However, I’m not too sure on the strap. I’m begining to appreciate Seiko a lot more these days and have even started to wear my sna759p1 that I received some years ago.

  • Mike V

    Well done once again Michael! I haven’t taken a minute to write in the past but it is your fantastic weekly installments of TBT that help make Fratellowatches my favorite watch site.

    • MikeInFrankfurt

      Thanks so much for such a nice comment…high praise indeed!

  • Rick Richards

    Great article. I have an original I bought in viet-nam in 69. Any suggestions on where I could get it serviced?
    Thank you

    • MikeInFrankfurt

      Where are you located Rick? USA?

  • frank hodge

    Hello Michael, many thanks for your article which I found very interesting. I am also a big Seiko fan mainly because of the one on my wrist as I write this! It’s a Seiko 7546-6040 “Pepsi” bought in Jeddah mid eighties I recall and apart from servicing/battery changes has been worn non-stop. I’m now retired but as a cameraman covering such stuff as war zones/famines etc , this watch has NEVER stopped and it’s accuracy continues to astound me ie 2 to 4 seconds gain in 3 weeks! As you might appreciate I also regard it as a talisman having been with me through some bad times and simply hope never to be without it! Cheers – Frank

  • Horacio Duek

    Great Article Michael. I am a big fan of Seiko and specially vintage divers. The 6105-8110 is just amazing. I enjoyed your article very much. Thanks!

  • You say it replaced Seiko’s original professional Diver series, but at WR 150m, it is definitely not a dive watch, or am I missing something?

    Otherwise: I love vintage Seikos. My favorite watch of all time (currently) is the G757 by Seiko. Beautiful 80s digital watch that looks like an old school super car.

    • Bacchus Leto

      It was not an uncommon depth for dive watches at the time. I think it’s worth noting that fifty fathoms is roughly 90m.

  • Rick in MI

    I wonder about the back on your watch. While I have seen a few like yours, it is very different than the vast majority of 6105s. And the fact that your example also does not have a complete serial number (only the first #, a 6), I wonder if this might be some sort of replacement back? (That said, my “gut” is that this back style is perhaps an early version, but the serial # is still very odd, don’t you think?)

    • Cobra Kai

      I assume the serial number has been…very artfully…removed in the pics for the purpose of this article? This style of writing on the caseback is actually a later style. Earlier watches used the more familiar ‘horseshoe’ style.