see pictures Quite often the serialnumber was also blind stamped (some handwritten) on the underside of the bridgefoot.
Occasionally the serialnumber was handwritten on one of the braces.
When the headstock shape of the Spanish electrics changed to the center-dip style the stamp was moved to the back of the headstock.
Wiedler wrote us May 2016: “The first Electar instruments from 1935 don’t show a serial number. 1936 serial numbers started possibly near SN 1 (first documented is SN 25) and reached the 7000s by the time electric instrument/amp production was virtually halted during WW2.
This manifested itself in the form of a blind stamped number between three and five digits, usually located on the top rear of the headstock.
(Fisch & Fred, , page 225) Wiedler wrote us June 2013: “The Electar series started at a lower s/n than 3-digit. Until circa 1938 the s/n stamp is located on the top edge of the headstock.
The Masterbilt serialnumber system did not start with the number 1000 but with the number 5000. The serial numbers were blind stamped on the interior back under the bass f-hole, generally below but sometimes on the (oval) label, maybe even without a label like the earlier Recording and Seville models.
From about 1934 forward, the serial numbers were ink typed directly on the label (Long Island label) or letter pressed on the label (rectangular Masterbilt label, Green label and Blue label).ELECTRIC GUITARS “While Epiphone’s SN systems for acoustic instruments and 1950s electric hollow bodies appear to be pretty straightforward, the SN systems of their other electric instruments and amps are much less so.Over the years a number of different SN systems were used.” (Wiedler) “With the inception of the Electar line in late 1935, Epiphone began a new numbering system which was employed solely on the electric instruments (Electar, Century, Coronet, Zephyr, Kent, Harry Volpe model).First of all, if anyone, especially a seller based in China is selling a Gibson Les Paul for an alarmingly low price, you probably want to pass. Fakes usually have the serial number either engraved too deep into the wood or inked (with too much ink).Keep in mind, Gibson never inked serial numbers on the Gibson Les Paul Standard but they did ink the custom shop series and some Les Paul Classics. On the real one, you can see the binding actually rides up, just a little, on the fret. Currently I have listed Zephyr Spanish SN 7182 as the last pre-war electric guitar.