what is this WESTINGHOUSE ELECTRIC factory (?) tag for/from??

Picked up this little (unpriced) 'loose item' from a table in the garage at an estate sale today. Asked the guy watching the garage how much it was, he answered: "ask the ladies at the checkout table inside, that's not my call". <lol> And by the time I looked around inside, found a couple more items to buy, and made my way to said checkout table -- said ladies answered the same 'how much' question with: "oh...what's that thing...I don't know...how about free?" **SOLD**!!! ;-) :-) :-) :-)

SO does anybody here have a clue what the little thing actually IS?? Physically it is a small [pictured with a quarter coin for size reference] stamped brass holder with rolled/folded edges on 3 sides, containing a paper tag w/clear plastic cover held in place with a brass eyelet, which holds the paper/plastic captive. Nicely stamped WESTINGHOUSE ELEC. CORP. logo on its back, the paper tag further identifies BUFFALO DIVISIONS.

My own first guesses were maybe something first used in a/the factory itself, for 'quality control' or whatever....further thoughts more along the lines of an ID tag once attached to some part of a piece of Westinghouse equipment. A little looking around the internets shows that Westinghouse had large factory operations in Buffalo (NY) from the early 1940's until mid 1980's, producing a wide range of things. Beyond that I don't have any idea...??