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Outside of a completed transaction, value has no meaning, so please do not ask me to value your guitar. Harmony instruments were produced on an industrial scale.
Even the less common models can't be considered "rare".
Remember that all Harmony made guitars (this means all guitars on this website) are still considered low grade instruments by most players and collectors, and can't be compared in value to the "great" names as Gibson, Fender, Martin...
The larger one is the serial number, and the part after the "H" letter is the model number.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.An exception to those rules is the late H68 "Artist", built from acoustic H1310 bodies, all solid.Photos below : solid wood on an acoustic H1311, laminated on an electric H58 - No known professional is specialized in Harmony parts only.