Rare and beautiful Bamboo bezel on this 1603 from c.1963. It fully authenticated by Bennison (see report in photos). 

Silver dial starting to become slightly golden with a warm brown hue in some spots

36mm unpolished case (with holed lugs)

Bamboo Bezel

auto 1560 movement

20 jubilee links on the bracelet, fits up to 7.5 inch wrist comfortably

authentic and signed bracelet and correct endlinks

signed screw-down crown pops out and screws down perfectly

The bracelet has worn down the serial number on the case but it is a 1963 series.  The ref number on the case is fully visible (1603)