1960s IWC "Ingenieur" Ref.666AD Cal.8531 Silver dial with Original Bracelet

Manufacturer IWC
Model Ingenieur
Year of Manufacture 1960s
Reference no. 666AD
Product no. A-6665
This is a masterpiece representing International from the early 1960s: the "Ingenieur" Ref.666AD SS with a silver dial, equipped with the in-house caliber Cal.8531. It is a model that has been in production from 1955 to the present day. This particular timepiece is from the later period of the first model Ref.666, which features the Cal.8531, and it possesses a unique dial layout with a calendar positioned towards the center, which is not seen in the second model Ref.866, equipped with Cal.8541. This distinctive feature gives it a one-of-a-kind character within the first series. It comes with a precious original bracelet (FF1A, 1/65, fits wrist sizes up to ~19.5cm).
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Item details

Serial no. 1,563,***
Caliber 8531
Movement no. 1,554,***
Movement type Automatic
Material Stainless Steel
Case size 36mm
Case type Screw back,Waterproof
Dial Original
Type of Indices Applied & Luminous
Belt Original (lug width: 18mm) / FF1A,1/65
Evaluation case 93%
Evaluation dial 93%
Evaluation mov 93%
Condition 4.5
Rarity 4.5

Other details

Case: The case has minor scratches and age, but retains enough of its original shape and volume. The bracelet has no significant elongation, and the wrist size corresponds to 19.5 cm.

Dial: The entire surface of the dial has been aged evenly with good texture, and is very atmospheric.

Movement: No problems with winding. Accuracy is around 20 seconds per day.