Nick Müller wrote:
How about posting all dimensions you have? #of teeth, outer diameter,
base diam., width (might give a hint to "metric").
So I (or others) can look up and see if I/they find out what it is?

Su
16 teeth
OD 7.890"
Base Dia. 7.577"
face width is .377" or 9.56mm

I've been trying to scan it, but I can't get enough contrast.