A New IWC Ingenieur Automatic In Two Sizes: Celebrating 50 Years Of The Genta-Designed Ingenieur SL
Gérald Genta designed many masterpieces during his lifetime, but the IWC Ingenieur SL is often mentioned in the same breath as two of his greatest designs from the same decade. The IWC Ingenieur SL ref. 1832 debuted in 1976, and 50 years later, it might be stronger than ever. To celebrate this milestone, IWC has introduced two versions of the Ingenieur. Meet the Ingenieur Automatic 40 50th Anniversary (ref. IW328910) and the Ingenieur Automatic 35 50th Anniversary (ref. IW324909). We got the chance to go hands-on with the 40mm version of this limited-edition series of 1,150 pieces each.
IWC Ingenieur Automatic 40 50th Anniversary
Celebrating 50 years of the Ingenieur SL
The story of the modern IWC Ingenieur begins in the 1970s, when the Schaffhausen-based company asked Gérald Genta to rethink its established Ingenieur. The original Ingenieur came out in 1955 as an antimagnetic watch designed for professionals working around magnetic fields. Genta’s response was the Ingenieur SL ref. 1832, introduced in 1976. “SL” stands for “Steel Line,” in case you were wondering.
Ingenieur SL ref. 1832 “Jumbo” — Image: A Collected Man London
Antimagnetism
One of the most important features at the time was its resistance to magnetic fields of 80,000 A/m (~1,000 gauss). Later models, in the early 1980s, had greater resistance (500,000 A/m or ~6,283 gauss). The model was also tested in an MRI scanner and withstood an incredible 3.7 million A/m (~46,495.57 gauss). We believe that today’s record still stands at 160,000 gauss, which was unleashed on a Seamaster Aqua Terra in 2017. All that said, IWC was ahead of its time in 1976, when magnetic fields were not as prevalent as in today’s world.
Gérald Genta
Gérald Genta’s touch
The design represented a significant departure from the earlier Ingenieur. Its integrated steel bracelet, five-screw bezel, and structured dial established the visual language that would define the collection for decades. It also arrived at a time when integrated-bracelet steel sports watches were beginning to emerge as a distinct category in Swiss watchmaking. As many of you know, the 1972 Royal Oak had been the first from Genta’s hand.
Like the Royal Oak, the Ingenieur SL was not an immediate commercial success. IWC produced only 598 examples between 1976 and 1983, after which collectors gradually rediscovered the model. IWC has brought back the Ingenieur several times with varying degrees of success. I’ve owned an Ingenieur 3227 (introduced in 2005), which was also a modern interpretation of the Ingenieur SL, but it was less true to the original SL than the more recent reintroduction.
In 2023, IWC revived the Genta-inspired design as a modern collection. For 2026, the company marks the 50th anniversary of the Ingenieur SL ref. 1832 with two limited editions of the Ingenieur Automatic, available in 40mm and 35mm sizes.
IWC Ingenieur Automatic 40 50th Anniversary
IWC Ingenieur Automatic 40 50th Anniversary
The Ingenieur Automatic 40 50th Anniversary (ref. IW328910) measures 40mm in diameter and 10.8mm thick, while the Ingenieur Automatic 35 50th Anniversary (ref. IW324909) measures 35mm across and 9.4mm thick. Both have brushed silver-plated dials, referring to a relatively rare silver-dial version of the original Ingenieur SL. The watches’ rhodium-plated hands and applied hour markers are filled with Super-LumiNova. For these editions, however, IWC has added a “50” marking below the lightning-bolt Ingenieur logo.
Both watches have the characteristic round bezel secured by five screws and an integrated stainless steel bracelet. The finishing combines brushed and polished surfaces. The 40mm model has a predominantly satin-finished bracelet, while the middle links of the 35mm version are polished. Both watches have a convex sapphire crystal on top (with an antireflective coating on both sides) and a 10-bar water resistance rating.
Caliber 32111
Powering the 40mm model is IWC’s automatic caliber 32111, which beats at 4 Hz and provides a 120-hour power reserve. It includes a soft-iron inner case for protection from magnetic fields. The 35mm model uses the IWC caliber 47110 (based on the Cartier 1847 MC), which also runs at 4 Hz, with a 42-hour power reserve. This version, however, has a sapphire-equipped display case back that shows the movement’s finishing and gold-plated rotor. Both movements display hours, minutes, seconds, and the date. IWC doesn’t indicate how antimagnetic today’s IWC Ingenieur Automatic model is. However, the 40mm version has a soft-iron inner case, just like the first SL 1832.
On the wrist
The IWC Ingenieur Automatic 40 is a very comfortable watch to wear. With its vertically brushed silver-plated dial and all-steel integrated bracelet, it looks sophisticated. There’s little to criticize here, and the small 50th-anniversary logo is a nice reminder that you’re wearing something special. The date window has an applied frame, and the date disc is silver, matching the dial color. On the 35mm version, the date window overlaps the minute track. I would have preferred that IWC skip the date window on that model to keep the dial cleaner. I also prefer the fully satin-brushed finish on the 40mm version, though I can imagine others like to see the bracelet play with light a bit more, which the 35mm edition does.
Although I think the movement is pretty enough to warrant a display case back, I appreciate the all-metal back just as much. It also leaves room for engraving if you want (for a 50th birthday, for example). The case back also indicates the watch’s limited status of 1,150 pieces.
Some afterthoughts on the IWC Ingenieur Automatic 50th Anniversary
Making the 50th Anniversary IWC Ingenieur Automatic watch in two sizes is a good move, as a 40mm case is too big for some, and for others, the 35mm case doesn’t work. It’s impossible to design a watch that fits everyone. You simply need to try them first before you decide. I found the 40mm version perfect for my wrist, and I also prefer some of this model’s characteristics to those of the smaller-sized Ingenieur Automatic 50th Anniversary. There’s also a substantial price difference between the two. The 40mm version retails for €14,800 / US$15,000 / £11,900, and the 35mm model comes in at €12,900 / US$12,900 / £10,400. This difference is mainly due to the different movements.
More information is available on the official IWC website.
