The only way to authenticate a Strings and Things reissue would be to find one that comes with a certificate or invoice from Strings and Things during the 1975-’78 time period.
You also have the top-of-the-line plush-lined hardshell case.
It’s ironic that, at a time in which Gibson was going through great strife with declining sales and profit margins, rivalries between the new Nashville plant and the Kalamazoo plant, and the downsizing and eventual closure of the Kalamazoo plant by 1984, the company was able to experiment and respond to requests for guitars that more closely emulated the beloved Les Paul Standard of 1959 – even though some of these attempts were way off the mark!
Chris Lovell, owner of Strings and Things in Memphis, placed a custom order for some Les Pauls in the mid ’70s that more closely approximated the original Les Paul Standard specs, including a narrower headstock, narrow binding in the cutaway, deeper carve top, etc.
The only hope appears to be where someone has had their guitar from new and can remember the exact year they bought it.
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