1950s Nicolet Watch Rare Non-Pusher "Co-Axial" Chronograph Untouched Case

Manufacturer NICOLET WATCH
Model "Co-Axial" Chronograph
Year of Manufacture 1950s
Reference no. ---
Product no. B-9988
Nicolet, "Co-Axial" chronograph, non-pusher, circa 1950s.

It is equipped with the very rare Landeron Cal. 251, which operates the chronograph, winds the mainspring, and adjusts the time using only the crown. This is a gem of originality with its unique non-pusher chronograph. The screw back water resistant case is in excellent condition with no signs of wear and tear from polishing.

To operate the chronograph: (without pulling the crown) turning the crown twice counter-clockwise starts the chronograph, turning it once clockwise pauses it, turning it counter-clockwise once continues, and turning it clockwise stops the chronograph and restarts it back to 0.
To manual wind: pulling the crown once then turning the crown clockwise winds the mainspring.
To adjust the time: pulling the crown twice then turning the crown clockwise or counter-clockwise adjusts the time.
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Item details

Serial no. 925,***
Caliber Landeron-251
Movement no. ---
Movement type Manual winding
Material Stainless steel
Case size 36.5mm
Case type Snap back Non-Water-resistant
Dial Original
Type of Indices Print
Belt non Original (18mm, between lugs)
Evaluation case 93%
Evaluation dial 93%
Evaluation mov 95%
Condition 4.5
Rarity 4.5

Other details

Case: minor scratches and age spots, but well preserved with original shape and volume.

Dial: Slightly aged, but no noticeable scratches or stains.

Movement: no problems with winding or chrono functions. Accuracy is around 30 seconds per day.