Business strike S nickels were minted in 1968 for the first time since 1954. It was also the first year for proof issues from San Francisco. It should be easy to discern a business strike from a proof- the proof will be brilliant with mirrored fields, strong details, and squared rims. In particular, look at the steps- business strike steps will almost always be mushy while a proof should have full steps.
Edited by biokemist6
12/28/2009 1:47 pm