I have the nickel version and the aluminum version, not to mention a nice example of the real nickel the design was taken from.
I only collect what I can find from circulation and roll searches. But fortunately I come across Canadian cents and 5 cent coins dated as early in the 1920's. My cent whitman from 1920-1960 is missing a couple of dates in the mid 1920s, my 5 cent coins I only have enough to nearly have the GVI and QEII section completed - I think I am missing 2-3 dates. Best roll search find from Canada has been a 1925 GV in EF. I occasionally turn up a silver 10 cent coin from bag searches, the other day I found a 1960.