Wide 5 hubcap ID help?

Just had a quick question, wondering if anyone could tell me what years these different Ford Wide 5 hubcaps are for.

 

BTTT because I've got a pair identical to the one on the right.

 

The one on the right is 36/37 and left is a 38 or 39 or maybe both.

 

The left is the same shape as a '39 Standard, but I don't think that's a Ford logo. I think it's an aftermarket cap (albeit a common one). The one on the right is definitely a '37.