1961 Topps Proof
 

Lookin for information on my 1961 Topps Proof #30 Nellie Fox Blank Back.
Any information would be helpful and appreciated. Thank you

Unless a proof card comes from Topps vault or differs in some manner from the actually issued card I think it is virtually impossible to distinguish a proof card from just a blank back card, of which there are many

Agreed; just a standard blank back. And not pre-war...

Proof?
 

I had always gone with the usual cardboard color backs as a blank back and true proofs as having a solid white back...... although I know this isnt 100% true its a start.