Most visitors online was 1660 , on 12 Dec 2020
I have done a little bit of searching (and looking more closely at the case marking) and I also see a small "A" and an "&" within the SS mark. I suspect this mark may be for Alex Sabin & Sons (New York) who were jewelry wholesalers and importers (as listed in the 4th edition of "The Jewelers' Index", 1927).I am also very intrigued by the case. I do not recognize the supposed casemaker's symbol (SS), although maybe this is a jobber's mark instead.
So I was just looking at this watch again and was thinking how you mentioned the dial being refinished, specifically noting the seconds track being the larger version. So is that why the seconds hand is so short?Thanks for posting an interesting example. It is always nice to see the dual-labeled Diamond/Maximus. The dial is unusual, but I suspect it has been refinished for a couple of reasons. First, on every Opera Watch dial I have seen the numbers track for the seconds lies immediately outside the sunken area for the seconds hand. The small sink for seconds is quite uncommon so it looks like the printing dies available to the refinisher were only for the larger seconds sink, hence the notable gap outside the sink. Also, I have never seen one with the "MAXIMUS" name on the dial.
I am also very intrigued by the case. I do not recognize the supposed casemaker's symbol (SS), although maybe this is a jobber's mark instead. A close look at your photo shows a shadow of a P.M. mark underneath the SS. I think this indicates a case made by Perry Marks who provided many other cases to Waltham.