This an RPD? There's a Snow 2 88/88, but I can't find images of it anywhere and I don't own the books.
Note the location of the 1 in relation to the bust and the dentils. I'll bet you a beer at Fun that it's the S4a. Can you bring it for Rick to look it over?
New pics after acetone treatment. Got a few green specks off. Now I think Larry might be right about S-4a. @ldhair can you post a pic of that variety? If not, that's okay. What's the rarity of a S-4a? Thanks.
I don't have a way to post an image. I'm still using Rick's book set from 2009. It stops at S6. The S4 is one of the more common. The S1 is probably the only one that has a high rarity. It's a DDO with a reverse off center clash.