Earle42,
The nickels are my favorites as well for the same reason.
Canadian nickels do have most metal types over the last 90 years: (Nickel, Tombac, Chrome plated steel, Cupronickel and Nickel plated steel). Even silver if you decide to include the small fish scales pre-1922 issues.
But Canadian dollars beat the nickels in terms of single year comparatives before the mega-commemorative era of today. Dollars had commemoratives in 1935,39,49,58,64 and 67 whereas nickels in 1943,44,45,51 and 67.
The record for varieties probably goes to pennies of the last 15 years (in terms of mint marks, magnetic vs non-magnetic, metal types)
Edited by 1945V
01/06/2013 10:58 am