1960 Mint Set Revisited

Hello again. Reading through the variety book while looking this mint set over and came across a really interesting quarter. The 1960P quarter in the mint set is a type B reverse, according to what I am reading although commonplace and a known variety the 1960 type B was designated for proof coinage and have appeared on coins circulation and business strike for years 1936-1967 and were inteneded for proof only. Judging this set the franklin is not a proof lacks the polishing has a grey mint token above penny and right of Ben. This should be a reverse type A. the D quarter is definitly a type a reverse as it should be. The type b reverse d mint is pretty rare according to the book. Anyone please? Thoughts? I think this is a amazing set-update the 1960 mint set was pretty commonplace for a coin like this to appear- FS-25-1960-901