One of the rarest and smallest chronograph in the world (only 29mm). Bulova cal 10 AH one button chronograph . Very good original condition . 10 K gold filled ; s/n 2578931 dated 1942 .

Dating an exact year for Bulova vintage is very difficult ! Bulova dating can be classified to three era : Pre 1926 , 1926-1949 n 1950 and beyond . This watch belongs to 1926-49 because the cal 10AH was made in the 1940s .
Once you got the approximate year u can use the series number marked in case back to date the exact year. For watch between 1926 to 1949, s/n starts with 2 indicates that either produced in 1932 or 1942 . Because of cal 10AH, this watch must be 1942!
Finally step to prove is through the symbol stamped marked on the movement ( Near the words U.S.A. ) . Viewed clearly from the movement, you will find two stamp marked : T (1942）and 米 ( 1941）. So this watch must be traced back between 1941 to 1942 and I will indicate the beginning of 1942 .
Overhaul recently . Very accurate n chrono reset to zero n function properly