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my guess would be mid 70s
i think thats when they first started coming out with back-stab type outlets:mad::mad:
 

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My guess, late 50's, early 60's. No alternative means of connecting, back stab only. Looks like it could be Sierra.
Scape all the sheetrock spray and see the maker's name and the U/L symbol. :rolleyes:
could be i started apprenticing in the late 70's most of the outlets we worked with had screw terminals only
 
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