IWC. A stainless steel automatic calendar wristwatch
Model: Ingenieur SL
Reference: 3506.1
Date: Circa 1980
Movement: 21-jewel Cal.37531 automatic, No.2424393
Dial: Grey grid, applied gilt hour markers, black outer minute divisions with luminous 5 minute markers, date aperture at 3, gilt pointed baton hands with luminous inserts, centre seconds
Case: brushed and polished tonneau form, screw down back, inner cap, No.2418401
Strap/Bracelet: Black IWC leather
Buckle/Clasp: Signed steel buckle
Signed: Case, dial & movement
Size: 35mm

Movement: Runs when powered
Dial: Good
Hands: Possibly later, in good cosmetic condition
Glass: Good
Case: Likely repolished at some point, nicks and surface scratches throughout, back of lug at 7 scratch numbered by watchmaker
Strap/Bracelet: Used, lightly worn in places
Buckle/Clasp: Surface scratches

We do not test any watches for their accuracy and as such timekeeping cannot be guaranteed.

We advise that if you are bidding on a watch, that you or your agents are completely satisfied with the condition of the lot. We recommend that all watches are serviced and polished after the sale as they are handled throughout the viewing period. Please note that although Bonhams endeavour to include reference to any replacement parts within our Condition Reports we cannot confirm that each individual element of the watch is original or that, if replaced, the replacement has been made using original manufacturer's parts.

Please note that due to the UK leaving the European Union there will be further import charges applicable if you are based in the EU. Please do familiarise yourself with local duties.