Nice! By 1967, 992Bs generally had melamine dials, but yours is double sunk vitreous enamel! The enamel dial is nicer, in my opinion, and the opinions of many.
The Fenchurch name as related to watches, shows up all over the ‘net, with modern wrist watches. @Helvetia History , do you know anything more about the second one of your two Helvetias?
We have time for one more 992B? Here is my no nonsense 1949 with single sunk Melamine Heavy Gothic dial #168 in a stainless steel Hamilton #15 case.