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I have trawled the internet, also your adverts and I have not been able to find an exact match. The closest I have found is this watch, https://www.worthpoint.com/worthopedia/solid-gold-bulova-watch-244515644 this also has a Dennison manufactured case but the batons on the dial are different. I think that watch also has an acrylic crystal with bubbles in it, they are a problem to me as the shadows they cast look like dark spots on the dial (there might also be actual dark spots as well) but no matter, I'm getting it replaced with something better as mine is cracked as you can see.
The case and back are both 9ct gold, the back has a Birmingham anchor hallmark and the 1964 date letter P, this ties in with the m4 movement. So it is probable that the back is not a replacement but was made for the watch. I understand that Dennisons were a case manufacturer for prestige brands.
The watch is running great and keeps very good time.
I'm hoping you guys can identify it. It was given to me by my late father before he died so it will not be for sale. He was an engineering toolmaker, his hobby was repairing clocks and watches and he came across this one in a random box of watches, some working some not, offered as a lot at an auction in Nottingham.