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Help in identifying old light switch

I changed out an old light switch (that was arcing the in the box - you could hear it) for my 73 year old mother-in-law. I was just curious if anyone could help identify how old it is. The house it came from was built about 1920 in Mobile, AL.

The single pole switch is black with a ceramic surround and exposed leg switch on the left side. No ground screw. On the back is stamped "J.I.P." and "975". On the face of the switch, it is stamped "J.I.P. Inc, Und Labs Insp". The writing on the lower half of face of the switch is blurred (due to charring). Was this original?

maintenance director
Re: Help in identifying old light switch

See if I can help, a little. No ground screw, old. Ceramic, they stillmake them, but older. Underwriters Labs started in 1894, after a worlds fair,(i think). So we know its newer than that. Came out of a 1920 house, could be original equip. Now, J.I.P. electrical is still in business in virginia. Dont know if its the same company or not, but they are electricians. Hope I could help, wayne...

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