Please help ID manufacturer of this thermostatic shower valve

[Al Robins]

Has no manufacturer markings at all. Thanks.

 

[Jeff Handy]

Pull back and take a full image, you are too zoomed in.

 

[Al Robins]

Thanks. Here is a better photo. It needs a new cartridge and unless I can determine the manufacturer, I will need to open up the wall and replace the whole thing.