.. the Porthole is a very special, with her 2 round little "bull-eyes",
one ( left) indicating the Power Reserve, the right other with
a small second hand
Finally, maybe a bit interesting to know, it's Cal 817/1,
Ref E502, 37 mm diameter, screw-back; (mine from ca 1957)
Ys, I do like her.. A lot !!
Thx again for your kind interest,
Best, hs