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From the AS 500 ebauche. This is the only Bulova movt based on the 500.
This 6S was signed with AS (Adolph Schild) underneath the dial and sat inside a 6716 with case serial starting with 130 that was engraved at the back with a date: April 3, 1924. Hence the date range of 1923 to 1924.
From the AS 500 ebauche. This is the only Bulova movt based on the 500.