I'm curious about #2, totally devoid of toning. Either this coin was dipped or else it was stored in something extremely secure, right?
Personally, a vintage coin is much more interesting when it has at least some toning, not like it was minted yesterday, and coin #2 looks too fresh for 1937.
My preference is coin #3. While it primarily has rim toning, I think it has more subtle toning throughout. I wonder if you could view these coins in hand, if coin #3 would actually have more luster than coin #2.
Coin #1 and #4 look really cool in my opinion, but just a bit much on the toning. coin #1 could be 100% natural toning, but in my mind I'm questioning whether there was some artificial component. Coin #4 is cool, but I just feel that it really reduces overall eye appeal.
Thanks for posting this!