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That appears to be a Price Pfister tub/shower valve.

Note 1- there are wayyyy more manufacturers/brands than just P.P. and Gerber. And each manufacturer has many (many many) different styles/models/types.

Note 2- it is not just the "stem" that the manufacturer/brand (and style/model/type) applies to; the whole valve assembly is manufacturer/brand-specific.

Note 3- while stems and trim are generally manufacturer/brand-specific and not interchangeable, this particular brand and model is pretty common (at least in the U.S.) and replacement parts are widely available from both the original maker (P.P.) and from others.

Note 4- I highly recommend that you remove the stems and bring them with you when you go to the plumbing shop to get the parts you need.

Answer from Jimmy Fix-it on Stack Exchange
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Danco
danco.com › home › shop › repair parts › faucet repair parts › faucet stems › 12h-7h/c hot/cold stem for universal brass tub/shower faucets
12H-7H/C Hot/Cold Stem for Universal Brass Tub/Shower Faucets - Danco
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