The Vintage Wrist Watch Company has dated this piece to the 1960s.
The watch has an automatic movement, 1438U, which is working nicely. The movement is fully signed and the serial number dates it back to 1961.
The Eterna Centenaire “61” was in production from 1961 to 1963.

The watch measures 34.5mm diameter excluding the lugs. The case is stainless steel and the condition is good, just the odd small mark but nothing too serious. The screw on case back is signed Centenaire on the outside and Eterna Watch Co on the inside. There is general marking across the back, probably from an earlier thread through strap.

The lens is in good condition.
The signed dial is in its original finish with dauphine hands, centre seconds and quickset date (initially set by repeatedly pulling the crown). Some light freckling across the dial.
A new leather strap has been fitted.
The watch will be sent in a new presentation box.
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