IWC Ingenieur 3505 SL Two Tone 1987

Industrial Sophistication, Rare Two-Tone Charm — IWC Ingenieur SL 3505

A rare icon from the 1980s, this IWC Ingenieur SL blends sporty engineering with understated luxury.

Produced for just a few short years between 1985 and 1989, reference 3505 is an elusive gem—especially in this two-tone variant with its 18k yellow gold bezel and original golden papergraph dial. The integrated bracelet and tonneau case echo Gérald Genta’s design language, while refined touches like gold indices, drilled bezel portholes, and a flawless original dial elevate the piece into collectible territory.

This example comes in excellent condition and includes its original box and papers—a full set that's becoming increasingly difficult to find.

 - wrist size in our picture is 18cm circumference -

BRACELET & CLASP:

• original IWC stainless steel bracelet with no stretch is fitting up to 18.5 cm wrist size (comes with two additional links to extend up to 19.5cm) / 3 mm thick
• original IWC stainless steel clasp

CASE:

• excellent overall condition, showing minor traces of use
• 3- body stainless steel / 18k yellow gold case with screw-down case back
• 34 mm (without crown) / 39 mm (lug-to-lug) / 23 mm (between lugs) / 9 mm thick
• year: 1987
• reference: 3505
• total weight: 117 g

MOVEMENT:

• IWC Cal. 375 - automatic
• 21 jewels, 28800 A/h, 42 hours power reserve
• professionally serviced 12/2024
• +7 sec/d / 270°