50 Years Of IWC’s Ingenieur SL Designed By Gérald Genta — A New IWC Ingenieur Automatic In Two Sizes
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 SL1832 was introduced in 1976, and 50 years later, it might be even stronger than ever. To celebrate this milestone, IWC has introduced two versions of the Ingenieur. The Ingenieur Automatic 40 50th anniversary (ref. IW328910) and the Ingenieur Automatic 35 50th Anniversary (ref. IW324909).
We were able to go hands-on with the 40mm version of this limited edition series of 1150 pieces (each).
IWC Ingenieur Automatic 40 50th Anniversary
50 Years Of 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 was introduced in 1955 as an antimagnetic watch designed for professionals working around magnetic fields. Genta’s response was the Ingenieur SL, Reference 1832, introduced in 1976. SL stands for “Steel Line,” in case you were wondering.
Ingenieur SL 1832 “Jumbo” — Image: A Collected Man London
Anti-magnetism
One of the most important features at the time was its resistance to magnetic fields of 80,000 A/m (~ 1000 gauss). Later models, in the early 1980s, had higher resistance (500,000 A/m). The model was 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, the Royal Oak in 1972 being 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 Reference 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
IWC is introducing two stainless-steel versions to mark the 50th anniversary of the Ingenieur SL. The Ingenieur Automatic 40 50th Anniversary, Reference IW328910, measures 40mm in diameter and 10.8mm thick, while the Ingenieur Automatic 35 50th Anniversary, Reference IW324909, measures 35mm across and 9.4mm thick. Both have brushed silver-plated dials, a reference to a relatively rare silver-dialed version of the original Ingenieur SL. Rhodium-plated hands and applied hour markers are filled with Super-LumiNova. The usual lightning-bolt logo has also been replaced by a “50” marking.
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 use a convex sapphire crystal with antireflective coating on both sides and are water-resistant to 10 bar.
Caliber 32111
The 40mm model is powered by IWC’s automatic Caliber 32111, which beats at 4Hz and provides a 120-hour power reserve. It includes a soft-iron inner case for magnetic-field protection. The 35mm model uses the IWC Caliber 47110 (based on the Cartier 1847 MC), which also runs at 4Hz, with a 42-hour power reserve and a sapphire case back that shows its finishing and gold-plated rotor. Both movements provide hours, minutes, and date indications. IWC doesn’t indicate how anti-magnetic today’s IWC Ingenieur Automatic model is. However, the 40mm version has a soft-iron inner case, just like that 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 has a sophisticated look. 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 sapphire case back, I appreciate the closed case back just as much. It also leaves room for engraving, if you want. For a 50th birthday, for example. The case back also indicates that it is limited to 1150 pieces.
IWC Ingenieur Automatic 40 50th Anniversary
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 to some 40mm is too big, and for others the 35mm simply doesn’t work. It’s impossible to design a watch that fits everyone. You simply need to try them first before you can make this decision. I found the 40mm size perfect for my wrist, and I also prefer some of this version’s characteristics to those of the smaller-sized Ingenieur Automatic 50th Anniversary. There’s also a substantial price difference between the two: the 40mm has a price tag of €14,700, and the 35mm comes in at € 12,800. This difference is mainly caused by the use of different movements.
More information can be found on the official IWC website.
