I am trying to ID the F -Stop ring on a Copal 1 shutter with a chrome outside ring. The F-Stop ring has the number 48 on it. It goes from F5.6 to 64

Can someone pleas check their 180mm and 210 mm lenses to see if this #48 is the same as the one on their shutter?

I am tryinmg to figure out what lens belongs in this shutter.. it is either a 210 or a 180, I think....
Thanks