Are you looking for brit spec headspace gauges?

[bonnie]

Yep, .064 and .074 are the only ones that matter. The .067 is a Vickers MMG gauge if memory serves. Please correct me if I'm wrong.

I think I'd shim an .070 or .071 if that's all I could get my hands on and save my money instead of buying the coin gauges. Just my humble opinion.

I use a .004 shim with a commercial .070 gauge. Peter Laidler mentioned that some time back, and that is what I do now. Made sense to me. I had thrown the supposed .070 max headspace gauge aside when I found it didn't actually measure anything. I'm not in the business but for the few I have, I still like to check and inspect for my enjoyment. More a piddler then ever a gunsmith.