The Vintage Wrist Watch Company has dated this piece to the 1950s.
The watch has 21-jewel automatic movement which is working nicely. This is the Felsa 690, first introduced in 1942, known as the Bidynator.
Early automatic watches had been powered with bumper movements.
Felsa subsequently developed an automatic movement where the rotor moved in both directions and this bi-directional was duly named the Bidynator.

The watch measures 33mm diameter excluding the winding crown and the lugs. The main body of the case is gold plated while the screw-on case back is stainless steel. There is a little marking to the case, and some wear to the back of one of the lugs.

The case back states that the watch is waterproof but, as with any vintage watch, it should be kept away from water and moisture.
The lens is in lovely condition.
The dial is signed with the brand name Ardath which was registered in 1935 in Geneva by Edmond Dreyfus. They made watches with movements supplied by major Swiss manufacturers, such as the Felsa that we have in this particular watch.
The dial has a very handsome textured finish, original hands and seconds sweep with red pointer end.
A new leather strap has been fitted.
The watch comes in a new presentation box.
The Vintage Wrist Watch Company has dated this piece to the 1950s.
Specialists in antique and vintage wrist watches and pocket watches
You can view the stock and full dealer information on the The Vintage Wrist Watch Company Profile Page