It’s Speedy Tuesday! Today we have a rare breed Speedmaster from one of our readers from the Philippines. Jun Cajayon is also member and moderator of the PhilippineWatchClub forums. Jun has been a long time fan of the Speedmaster Mark series after he tried a Mark II for the first time a few years ago.

Speedmaster Mark 4.5

As you know, the Mark series were introduced in 1969 with the ref.145.014 Speedmaster Mark II. A more modern case (for that time), but with the same hand wound movement caliber 861 as in the Moonwatch. These Mark series were in production parallel to the Speedmaster Professional ‘Moonwatch’ (145.022).

One of the strangest Speedmaster watches from the ‘Mark’-era is definitely this 176.0012 from Jun Cajayon. It is very similar to the Mark IV but certainly not a Mark V ST376.0806 (except for the movement). So, although there is no mentioning of ‘Mark’ on the dial (like the Mark II – Mark V range), people nicked it the Mark 4.5. It is the Speedmaster reference that seems to be a mix between the Mark IV case and Mark V movement.

I can imagine what attracted Jun to the Mark series, especially the tonneau shaped cases from the Mark IV and this Mark 4.5 model. Although the Mark IV has an interesting movement, the caliber 1040 (we reviewed the Speedmaster 125 with chronometer variant of this particular movement in a past Speedy Tuesday) is not as sought-after as this caliber 1045 movement. This caliber 1045 movement has been based on the famous (and discontinued) Lemania 5100 caliber.

According to the owner, the production year of this particular Speedmaster Mark 4.5 ref. 176.0012 is 1979. In his e-mail, he tells me that he’s looking to add a Mark II and Mark III as well to his collection.

An interesting read on the OMEGA caliber 1045 can be found here, as documented by the legendary Chuck Maddox. It includes an overview of all Speedmaster models that have been equipped with the caliber 1045 (Lemania 5100) movement.

A big thanks to Jun for playing along with our Speedy Tuesday topic. If you are interested in having your Speedmaster featured here, contact us. We are looking for any kind of Speedmaster, new or vintage. A cool anecdote, piece of history or background information would be nice!

  • These Speedmaster are very appealing, though I wonder why this one has a Seamaster case back?

    • Hi Christopher,

      In fact, almost all Speedies have a Seamaster caseback (hence the Seamonster logos). Initially, the Speedmaster was part of the Seamaster collection. This of course changed and became a collection of its own. This particular one really says ‘Seamaster’, which was quite common in the 1970s for Speedmaster models.


  • Ah, thanks Robert-Jan. A small detail I’ve never really noticed before.

    – You learn something new everyday šŸ™‚


  • Dear RJ,

    Many thanks for choosing to feature my Speedmaster in your fantastic blog. I’ve been a long time follower and reader. I’ve been enamored by the Mark Series as it is highly distinguishable from the Moonwatch by it’s tonneau shape case (Mark II, IV, 4.5) and Flightmaster case (Mark III). Plus the fact that this was produced in a limited run by Omega makes it collectible. Good clarification on the Seamaster caseback. Funny how the “sub-brand” Speedmaster turned out to be as poular or even more popular than the Seamaster line, necessitating it to be spun off and stand on it’s own. I love the Lemania movement as it adds so many usable functions to the watch. No wonder that watches with this movement are being sought out by collectors (Omega and other other brands). This particular piece I acquired from a fellow collector is extremely mint in condition and has retained the correct polish, sunburst brushed finish on the case. I want my future Mark II and III to be in the same condition since this will stay in my watchbox for a long, long time. A lot are offered in the market now but only with patience can you acquire an excellent piece. Hope that I can also share my future acquisitions in your great blog.


    Jun Cajayon

    • Hi Jun,

      Thanks for your comment and I am happy that you participated! Always good to hear from long time readers of the Fratello blog. It seems like the Mark series were real tool watches, functional timepieces with ditto movements. No wonder why the Lemania 5100 and 1340 were so popular in the 1970s and early 1980s. It is a pity that OMEGA stopped creating these functional pieces. However, brands like Sinn and Tutima still create similar watches. Real tool watches. I believe that Tutima still sells watches with the Lemania 5100 movements, as one of the few brands out there. Probably using the last of their stock.

      Anyway, please do share your future acquisitions with us. The Speedy Tuesday topic is definitely becoming the most popular ‘day’ on this blog and I believe that a lot of people will be interested in your queste for the right Mark-series watches.