Model and Date Stamps
Harmony hollow-body instruments were marked with inkstamps within the body of the instrument. A model/batch number of the form nnnnHmmmm where 'nnnn' is a batch number and 'mmmm' is a model number ('6072H950' for example would be an H950 model). They were also stamped with a date stamp with the season and two-digit year ('F-45' would indicate the instrument was manufactured in the fall of 1945). Only 'F-xx' and 'S-xx' are found as date stamps, S could be summer, perhaps Harmony synchronized its orders with the main catalog distributors (as Sears & Roebuck, Montgomery Wards). A former Harmony employee reported a different scheme: "We worked 10 hours, 5 days a week, any 8 more every Saturday. That was both shifts. I believe the "F" and "S" on the serial numbers was for first or second shift."
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