A former Harmony employee reported a different scheme: "We worked 10 hours, 5 days a week, any 8 more every Saturday. I believe the "F" and "S" on the serial numbers was for first or second shift." == OEM models == guitare harmony model 1290h165 Harmony was also an original equipment manufacturer (OEM) for several other brands, most notably Silvertone.
OEM models were typically very similar to a Harmony instrument but with cosmetic differences.
Harmony's model numbers consisted of an 'H' followed by a 2 to 4 digit number. Harmony hollow-body instruments were marked with inkstamps within the body of the instrument.
A model/batch number of the form nnnn Hmmmm where 'nnnn' is a batch number and 'mmmm' is a model number ('6072H950' for example would be an H950 model).
The name is now used by an unrelated company based in Illinois that imports guitars from Asia.
More info on vintage Harmony guitars at Harmony Database * From Wikipedia As previously stated these old 1260s are becoming collectors items and owners are forever looking for ways to bring out the best in them.
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).
In the years from 1945 – 1975 the Chicago firm had mass produced about ten million guitars. The Harmony Guitar Company ceased trading in 1975 and sold the Harmony name.
The company reduced their output over the years, later focusing on student models sold through JCPenney.
The pickups on almost all electric guitars and basses that Harmony produced were manufactured by Rowe Industries Inc./H.
In 1928, Harmony introduced the first of many Roy Smeck models, and went on to become the largest producer in the U. They sold 250,000 pieces in 1923 and 500,000 in 1930, including various models of guitars, banjos, and mandolins.
In the late 1930s, the firm began making violins again after a 19-year hiatus.