I'm starting to think Lisa has one thrid party newspaper ad showing this watch as the "I" and saying "in white or yellow", however that ad may have gotten the "I" variant wrong. It is third party.
The official Bulova model price lists, which were contract modifications to the Fair Trade Pricing agreement btwn Bulova and dealers shows the "I" in 1961 and again in 1964 as being priced at $175.
These lists were highly scrutinized, as they were US wide contract modifications.
...and when I check the prices for BB's at $89.95, there are two-letter variant diamond dial variants at this price, but none of them are the "I".
I'm going for BB no variant.
I'd go one tick not confirmed if its ID'ed as the "I". I think these yellow and gold watches in this period were two letter variants- and its unknown which two letters that would be.
The ad stating "I" is just a misprint/mistake. Are there any other ads showing this watch as the "I"?
EDIT. I guess we do have two ads showing this as the "I".

and ad below 1965.
