First time "poster" having quite a time identifying the manufacturer and model of this shower valve, cartridge and controls. The wall valve on the left side reads ASSE 1016-T 119NO. The wall valve on the left side reads UPC B-125 and appears to have a "SA" logo. The shower knobs appear to have "GS" in the knob covers. Beyond this there are no other identifying marks.
Would like to i.d. these components to determine what parts are available and if there are any retrofit parts that could be installed to allow for more modern controls. Thank you in advance for your replies.