The Vintage Wrist Watch Company has dated this piece to the 1960s.
The watch is a good size at 35mm diameter excluding the winding crown and the lugs.
.. they Dreyfus family founded Rotary in 1895. There is also a full set of Swiss hallmarks.

The case has a small knock to the side, and some unevenness to the back but overall is in good condition for a piece from 1960.
The lens is in good condition.
The signed dial has some age related marking but still very easy to read.
A new leather strap has been fitted.
The watch comes in a Rotary presentation box.
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The Vintage Wrist Watch Company has dated this piece to the 1960s.
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