This is the one I have always known as flowmatic: http://www.amazon.com/DANCO-A0088734.../dp/B000H5YCO8

I don't know what the inside looks like!!! I agree that the OP handle is similar, but the one I am familiar with has a star-shaped screw cap. The handle to me also has an American Standard 'smell' to it, but I am put off by the lack of any logo on the escutheon.