Added some additional pictures of the movement. Hopefully this helps. Sorry if the picture quality isnt that good, these were taken with my IPhone.
The box the watch is in identifies it as "The New American GIrl Bracelet Watch Bulova". It has the price tag still of $75.00. I believe it to be from 1952 as it indicates L2 on the back. On the watch face it says Bulova at the top (below the 12) and Swiss at the bottom (below the 6) The back also indicated 14K GF. The bracelet indicates 1/10, 10K, GF. It's shape is square with a diamond pattern on the bracelet. It has what I believe to be white gold diamond shaped adornments with diamonds on both sides of the face. The watch still runs. I can't read the movement symbol (not a strong enough magnifying glass around). And not sure where to look for crystal dimensions. I also can't get a good enough picture of the insides to show you, but provided what I have. We found this watch amoung my Mother-in-laws things when she passed away. It's in excellent condition and I don't believe it was ever worn.
Gents, you all know how many American Girls I have, or have had. I'm inclined to believe that many were also marketed in Canada as Canadian Girls. In this case, I'd say the display case confirms it's an American Girl. I've seen almost all the models I've come across in both yellow and white without a change in variant. No proof to offer Just my experience with the model line. I'd say post it as an AG as plains suggests.