Nice, 4 years in and still waiting for my first Buff and/or indian head. Shield, SLQ,, WLQ , silver dollar etc etc etc. Lots to check off some day. Congrats on that buff.
As always, be sure to check the date first but ...
I've clean hundreds of old Nickel's with very fine Steel Wool and / or wet Brillo Pads.
It takes a lot of elbow grease but they usually look great when your done !