Thanks for your response Mark, the case is 18 k. Interesting catalogue info you have there, never realised there were so many variants.
Cheers Phil

Hi Phil.

: Your guess is a couple of decades out! The watch is from some time
: in the 1940s.

: I presume it's gold plate or gold filled rather than solid gold? In
: that case, it would be a 342, similar to one of the steel 333s
: in this catalogue:

:
:

: There are a variety of dials in these, but the brass nubs and 6 and
: 12 markers are pretty constant, although the numerals come in a
: couple of different styles. I believe the movement should be a
: Valjoux 22, but I don't have one myself to check.