1990s IWC "Ingenieur" IW3508 S.Steel Rare 500,000 A/M Automatic Black Dial

Manufacturer International
Year of Manufacture 1990s
Reference no. IW3508
Product no. A-6533

This is a rare masterpiece from the early 1990s manufactured by International, called "Ingineer" Ref.IW3508. It features a black dial and is a scarce 500,000A/M model. By using a zirconium alloy hairspring instead of the previous soft iron inner case, it achieved a 500,000A/M anti-magnetic resistance. However, due to its vulnerability to durability and temperature changes, it was produced for only a short period from 1989 to 1993.

With a case diameter of 34mm and a thickness of 9mm, the IW3508 is relatively small in size but still offers a high anti-magnetic resistance of 500,000A/M and water resistance up to 120 meters, earning it the nickname "Skinny Ingineer." It is a rare piece, as the combination of a stainless steel case and stainless steel bracelet is said to be limited to only 614 pieces, available in both black and white dials. It is powered by the Cal.37590 movement, featuring a 5-position adjustment 21-karat rotor. The package includes a repair estimate from 2011 and a spare bracelet.

Add to Favorites Inquire about this product

Item details

Serial no. 2,502,***
Caliber 37590
Movement no. 2,436,***
Movement type Manual winding
Material Stainless steel
Case size 34mm
Case type Screwback, water-resistant
Dial Original
Type of Indices Applied & Luminous
Belt Original
Evaluation case 93%
Evaluation dial 95%
Evaluation mov 95%
Condition 4.5
Rarity 4.5

Other details

Case: Minor scratches and age, but retains original shape and volume, as well as serial number on the back. The bracelet does not feel stretched and it is possible to add frames from a spare bracelet. The bracelet screws are partially sticking.

Dial: very clean with no visible scratches or stains.

Movement: The movement is well wound and screwed down, and the accuracy is around 30 seconds per day.