Technical Ford or AMC? Crank Pulley I.D. Help Needed.

Hey guys, I think I'm close on this pulley but could be wrong so I figured I would ask here. The dimensions are as follows. The bolt pattern is 2.680" center-to-center. The center bore is 2". Outside diameter is 6-3/4" on the rear two grooves and 6-3/16" on the front two grooves which notably seem deeper than normal. Mounting surface to front face is 3".

My guess is that it's a Pre-70 Ford pulley but I haven't been able to find a similar one so I could be wrong. Anyhow, hopefully one of you guys can help me nail it down for good. As always, I appreciate the help!

 

It also looks like AMC may be an option as well?

 

It does look a lot like an FE ford pulley from the 60s. But they were really good about stamping a part number on theirs.

 

I thought the same thing about Ford being pretty good about stamping part numbers. However, AMC did not seem real good about stamping them from what I've seen so far and I've seen A LOT of pulleys.