I believe this is a 1928 Buckingham but I am not a watch aficionado. It's just a watch I found years ago and am curious about. The hands on this watch ALMOST match the image of the ad posted on the site for a 1929 Buckingham, but are slightly different. The ad appears to be an illustration though so maybe the artist didn't draw every detail of the hands. The hands on the watch I have definitely do not match the hands in the 1929 Buckingham photograph on the site. So, I wonder if the advertisement photo is actually for the 1928 Buckingham.
Regarding the case serial number, the second digit appears not to have stamped fully into the metal. It could be a 3, an 8, or a 9. There are also several numbers and letters scratched into the inside of the case back.Very difficult to read even under magnification. Maybe "signatures" of the craftsmen who worked on it?
Interested in any light you all can shed on this. Hopefully also contribute a missing piece to your database. Thanks.