1960s Longines Cal.30ch Diver Chronograph "Big Eye" Ref.7981-1 Rare 1st-generation

Manufacturer LONGINES
Model Flyback Chronograph
Year of Manufacture 1960s
Reference no. 7981-1
Product no. A-6826

Late 1960s Longines Diver Chronograph "Big Eye" with Flyback Function, Equipped with the Renowned Caliber 30CH, Stainless Steel, 40mm, Ref. 7981-1. This is a rare first-generation model. Among the Caliber 30CH models, it stands out as a sports type with a classical design, featuring a 40mm rotating bezel, screw-back waterproof case, and a distinctive tachymeter black dial known as the Big Eye.

The specifications differ between the early 7981-1 and the later 7981-2 models. This particular piece is an early model with Caliber 30CH, slim luminous hour and minute hands, leaf hands on the sub-dials, and "LONGINES/WATERPROOF" engraved on the case back, making it a valuable initial model. It comes with the original bracelet (fits up to a 20cm wrist). Longines' in-house caliber chronographs are renowned in watch history for their precision and craftsmanship and will continue to be highly regarded and passed down in the future.

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Item details

Serial no. ---
Caliber 30CH
Movement no. 13,939,***
Movement type Manual winding
Material Stainless steel
Case size 40mm
Case type Screw back Water-resistant
Dial Original
Type of Indices Luminous
Belt Original 20mm
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 shaping and volume, and engraving on the back. The rotating bezel is in good working order. The bracelet is not stretched and the wrist size corresponds up to 20 cm.

Dial: clean with no visible scratches or stains.

Movement: Unadjusted, will be delivered after maintenance.