I would say there are tiers: 1948 (undisputed king of the set) 1947 maple leaf (quite scarce) 1945 1947 1938 1946 (not quite as scarce, but still a semi-key date)
Interesting thing about the 1911 $1 coin, it carried the "Dei Gra" ( Dei Gratia ) on the obverse which was missing on the other 1911 issues. == image of REPLICA ===