I'm not up to spped with antique pieces, but looking at the
enamel dial, strap lugs and serial number, I'd expect that it's
from the 1930's or so. It appears to have been manufactured
for Robinson's by a third-party watchmaker, which was common
practice at the time.
If you do want someone to have a look at it, you could take it
to Passions at Funan. Be advised, however, that since these guys
are in the buying business, they'll probably undervalue it.