Been a little busy behind the scenes. 
From 1971 to 1980 the Lombardo Mint in Canada minted these North Dakota Souvenir Dollars.
There are 10 designs to this set. The 1971 has a more crude Indian design on the front than the rest and it can also be found struck in copper.
I have seen 1981 and later North Dakota Souvenir Dollars but they are made by Metal Arts Co. and in my opinion, not part of this set.
There might be a 1972 error issue or scarce variety, it may just be that of excess leftover copper planchets from 1971 used in striking some 1972 issues or perhaps some other minting error.
I'll look for others but not worried about them.
There also may be an 11th "Special Northern Pacific Railway Depot" edition in the mix.
It has a theme for The Northern Pacific Railway, but not to be confused with the 1981 John Miller - Mandan souvenir dollar.
I have seen .999 silver issues here and there but again, these would not be part of my collecting idea here. (yet)
I do like the Indian head on the front of these, which is what caught my eye to start, but I decided to make a set because I found 9 of the 10 in one lot at a really good price and then hunted down the 1973 to finish it up.
1971 to 1980 North Dakota Souvenir Dollars
1971 North Dakota Souvenir Dollar - Crude Indian / Eagle in flight
1972 North Dakota Souvenir Dollar - Indian / Homestead Family
1973 North Dakota Souvenir Dollar - Indian / Power of Dakota
1974 North Dakota Souvenir Dollar - Indian / Ox and cart
1975 North Dakota Souvenir Dollar - Indian / Peace Garden
1976 North Dakota Souvenir Dollar - Indian / 39th State
1977 North Dakota Souvenir Dollar - Indian / Meadowlark On Stump
1978 North Dakota Souvenir Dollar - Indian / Deer
1979 North Dakota Souvenir Dollar - Indian / Sakakawea
1980 North Dakota Souvenir Dollar - Indian / Eagle appearing on state flag
1972 South Dakota Souvenir Dollar - Crude Indian / Pheasant Capital of The World
Unusual re-use of the 1971 North Dakota Souvenir Dollar obverse design with a date of 1972.
A neat crossover and certainly a "key" as I am collecting my companion set from 1971 to 1980 for South Dakota Souvenir Dollars as seen below.
Unlike the "normal" issues, this one does not have a serial number on the edge.
It does have MADE IN CANADA (incuse) on the edge like the 1976 and earlier issues.
This same pheasant reverse was also used on the more commonly encountered "Under God The People Rule" obverse where an Indian on horseback rides and Mount Rushmore is seen in the background. South Dakota Souvenir Dollars were also minted for the same 10 consecutive years as the North Dakota with that obverse and a variety of reverse designs starting in 1971 ending in 1980.
1971 to 1980 South Dakota Souvenir Dollars
1971 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / Land of Infinite Variety
1972 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / Pheasant Capital of The World
1973 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / Pray for Peace Eagle
1974 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / Discovery of Gold
1975 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / Pioneers Covered wagon
1976 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / 40th State
1977 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / Sioux Falls
1978 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / Wolf
1979 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / Corn Palace
1980 South Dakota Souvenir Dollar - Indian on Horse Mt Rushmore / 1889 Great Seal of South Dakota
The 1980 South Dakota is the only one I don't have yet. I could easily grab a Copper 1971 North Dakota Souvenir Dollar but those I see have ugly black splotches. I would only pick out a nice red or nicely toned red brown example which I can wait for. If I pick any of those up, the gallery collage images will be updated to reflect that in the future.