Vietnam, Canh Thinh?

[Figleaf]

Looks most like a variant of KM 162, but KM is too cryptic for me to be sure...

Peter

[Manzikert]

I assume as you've not shown the reverse that it is plain, in which case I'd say KM 161.1, Hartill [Chinese] 25.34; Barker 95.1-95.10; Toda no. 202.

Alan

[Figleaf]

It is indeed plain. Thank you Alan. KM 161.1 was my best suspect, but it's not illustrated in KM and I haven't the foggiest what a "double rim" is...  You know, it could have been that rare variant last seen by an 18th century French priest just before he succumbed to thirst during water torture. Problem solved.

Peter

[Manzikert]

The double rim is like two concentric circles, as if someone has dug a groove round the middle of the reverse rim. I have a couple, but I don't have a scan to show: I'll try and dig one out tomorrow.

Alan

[Figleaf]

Mine doesn't seem to have the double rim as you describe it. Yet, somehow I doubt it's a super-scarce variant.

Peter