The Thunderbird

Here comes Rolex Thunderbird Datejust Ref. 6609.  The name Thunderbird came after the US Air Force aerobatic squadron has choose this Rolex as their official wristwatch.

Armed with Oyster Perpetual, Datejust, Superlative Chronometer, Officially Certified.

Movement Cal. 1065 self-winding, Circa 1956.  This is the second edition of Thunderbird which follows its successor.  Cal. 1065 is the latest movement of Rolex at the time.  

Very nice butterfly rotor !

Geared with caliber 1065 nickel-finished lever movement equipped with 25 jewels to maintain super-balance. sweep center seconds, and aperture for the date.

The caliber was not long produced until 1960 where Rolex introduced the modern version of Thunderbird called "Turn-O-Graph".

Diameter: 36 mm.  Tonneau-shaped, polished and satined, screw-down case back with twin-lock crown.