Need help identifying shower diverter valve
My name is Paul and I have minimal plumbing experience. Anyway, a couple of weeks ago, my shower diverter valve began not diverting water to the shower as it should when I turn it. In the process of removing it, I broke the stem.
Anyway, I took it to Home Depot, but their plumbing guy couldn't identify it and thought it might be European or maybe even Spanish. I took it to an expert plumbing store, but they couldn't match it in their reference book, although they thought it might be a Grohe.
Attached is a photo. It is at least 15 years old and has a 20 spline broach. Any help is appreciated.