This appears to be a 1935 Bulova American Girl with an engraved case and two diamond accents. The case is 10KT yellow gold filled with a nice personal engraving on the back. The dial is white with full yellow gold raised Arabic hour markers and gold hands. The movement is a 7 jewel 7AF caliber with a triangle date code. It looks to have the original bracelet and a Bulova case that predates the watch by a decade. If you read the ad closely it does confirm the engraved model came in two dial configurations, PLAIN FIGURES and STICK DIAL. From my research the full Arabic hour marker unengraved case is the variant C based on one of the ads, while most of the other AG ads have the engraved case with full stick hour markers but no variant listed. I have not seen an ad that confirms what variant A is or if it is a variant B. So based on the ad 1935 Bulova American Girl no variant. At least for now anyway.
Very nice American Girl. Congrats Jim with this find!
In reply to Very nice American Girl… by Alex
Thanks Alex....I am quite surprised we only have one other AG with the round case from this period in the db. It was very heavily advertised so you think it would have been more popular and showed up more often.
It's interesting that in the advert the BULOVA name is in parentheses while the watch name in presented first. 1935 American Girl "BULOVA"
In reply to It's interesting that in the… by Geoff Baker
Yes, I call them the Bulova divas. Like the Miss America, typically advertised as “Miss America, by Bulova”. As if they were brands on their own.
Here's another advert showing the 7 jewel count.

Nice addition Jim!
1935 Bulova American Girl