Help - Identify Old Amer. Stand. Mixing Valve
first time poster, hoping someone can help me out. I have an old American Standard single lever shower mixing valve that has been leaking like crazy.
I have attached photos since they are worth a 1,000 words -- I'm not a plumber but have renovated houses most of my life so I am a fairly competent jack-of-all-trades, but I'm hoping for a little direction on the steps I need to repair this also. The house was built in 1954 but for some reason I feel like this fixture is older then that - it was a builder's own home and he was the only owner before me.
The handle has a part number of L-1192-2 and the cover plate is 922-1 but I haven't been able to find anything online about them.
Thanks in advance for any help.