I have some Pre-1960 nickels that I have been saving over the years that I want to cash in, but first, what to save besides the low mintage date/mintmarks?
Well war nickels are 35% silver, so you'll want to separate those out. http://www.coinflation.com/coins/1942-1945-Silver-War-Nickel-Value.html Also check for the popular errors: 1939 Dbl Monticello & Five Cents, 1943/2-P, and 1949-D/S
Knew about the war nickels but yes, this is what I am looking for. Errors or different varieties that are worth looking for. Also, what mintage level makes them worth saving?
The Jefferson Nickel series has very few key-dates. Only two specific dates come to mind besides the varieties mentioned above: 1939-D & 1950-D. Keep those for sure along with any war years.
Here's a good guide on what Jefferson nickels to look for: http://coinauctionshelp.com/Jefferson_Nickel_Page.html#.UrKQmbR0nKd Good luck!
You're very welcome, I have tons of pre-1960 Jefferson nickels to look through as well and it's a great guide on what to cherry pick