1980 'Gibson Pickups & Parts' brochure, page 8: details of the Posi-Lok strap locks.
A strap that slips off can mean the end of a great guitar. Not to mention a great performance. But conventional strap locks don't always stay secure. Especially if you don't stay in one place. Now there's a strap snap solution. The revolutionary Gibson Posi-Lok strap lock. Elongated instead of circular, so it fastens across the strap slit. It holds tight when you let loose. The Gibson Posi-Lok. Because you can't move freely unless you're strapped in tight.
In February 1981 a pair of Posi-Lok strap buttons had a list price of $6.50 (nickel) or $7.75 (gold).
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