Replacing unknown brand shower faucet cartridge

[Walter105]

My elderly neighbor needs to replace a shower faucet cartridge but the neither the handles, cartridge or valve body(3 handle) are marked with a brand name. The valve assembly was installed 10 years ago but she can't remember the plumber's name. Several plumbers quoted replacing the valve assembly for $1200 -1500. Ouch!
Is there a way find the manufacturer/brand Thanks.

 

[Terry]

A picture of the trim and handle may be all we need. 800 pixels or less.
If you do pull the trim, then an added picture of the valve helps too.

 

[Sponsor]

 

[Smooky]

In addition to what Terry said, it also helps if you can remove the cartridge. Clean it up and lay it next to a ruler and take a picture. A picture of the end of the cartridge where the handle attaches can be very helpful as well.