Your observations mirror my own Arthur. 1977 was probably the first year this coin was struck by the new presses in Winnipeg. It was strongly struck, which also was probably detrimental to the life of the dies - this is the lowest mintage year also. The thick, raised rims allowed for protection of the coin's struck surfaces. 1977 is one of the easiest years to get a gem MS-65 or MS-66 strike, only 1968 and 1982 Constitution dollars are easier to find in high grades. You can also find some (but not all) 1974 nickel dollar coins with a similar, wide rim.
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Edited by SPP-Ottawa
02/16/2014 4:50 pm