Swiss Made, Hidden Spaceview Black on Black Chapter Ring, The case #640-1 has a stainless steel back and a 40 micron gold plated bezel.
Accutron
I'd be fine with putting the 23103 info in the variant field, and would go tentative if it went that route. The production date is beyond our most recent price list, so I didn't check to see if 23103 was listed. I doubt this was out in 1964, but I'll check anyway....
With Swiss ad and this being a Swiss watch, we may not expect to see 23103 in later USA Bulova Fair Trade Price List contract mods anyway, regardless of year of production or year of USA price lists.
There were no 23xxx (or 22xxx) Accutrons in that spring price list. Lots of 20xxx, 21xxx, 24xxx, 25xxx, 26xxx and 27xxx numbers listed in Spring 1964 USA lists.
These unique Bulova product numbers must have more info/patterns in them than we can translate at present.