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They always are on a place easy to read, ie near the f-holes on a archtop.

The larger one is the serial number, and the part after the "H" letter is the model number.

Ok, there is some rare exceptions to this rule, for some very late models produced a couple of years before the close of the factory in 1976.

Kay was known for mastering the laminated techniques, Harmony for using only solid wooods.

It looks like Harmony serial and date stamps were meant to manage the different parts and instruments on the production line, not to be used as reference by collectors 50 years later... - My brother has a Harmony Meteor in great shape but the the serial number is 84H8448. Do you think someone added the Meteor Label on the Headstock? - These stamped numbers inside Harmony made guitars were not intended as real serial numbers.During the last two weeks of June an effort was made to finish as many orders as possible and not start any new orders.The last days of June, we had a complete inventory.It seems Harmony reset these numbers in every batch of the model, so a "6690H22" can be older than a "123H22" for example.Tip : on many guitars (easy to check on flat top acoustics), Harmony stamped the top of the guitar as well as the back, so if the number on the back is difficult to read, use a mirror and check under the top (near the neck) The other smaller stamp is the date stamp and indicates the year of production.