The story on this quite rare jersey is that it was removed directly from (Warroad product) freshman Alan Hangsleben’s locker stall in the spring of 1972 by a Sophomore player on the team, who then had it in his closet for the following 49 years.   As evidenced by the removed arm captain’s C, it had to have been recycled from an earlier season, since Alan did not wear a C in his freshman year.  The most obvious guess is that it would have been (Roseau product) Mike Baumgartner’s 1970-71 jersey as well, making this a jersey that was team-worn for at least two years.  That wouldn’t be hard to believe with the amount of team-sewn repairs that the jersey has endured.  It is possible that it was from before that, such as when #5 Terry Ogden was a captain in 1967-68, but that would be asking perhaps too much. #5 Don Ross (another Roseau product) was on the first team to wear this style at  North Dakota in 1964-65, and was the senior captain that year, but I don’t see evidence of a C being attached and reattached twice or 3 times.  More likely, it was Baumgartner’s and then Hangsleben’s. 
I did believe that this is only the second of this 1964-1972 style Sioux jersey known to the jersey-collecting hobby, and only the first green one.  However, I have now seen photos that were thought to possibly be from the white twin set to this style and there was a notable and documentable difference.   The difference is in the arm stripes.  These earlier ones had two arm stripes while the next iteration had three.  At this moment, I am aware of not one other example from this style of North Dakota jerseys.  To find any example from these early Sioux Blackhawk-style-logo teams would be shocking, but to find one that was worn by not one but two two former NHLers (one from Roseau and one from Warroad), well that's pretty incredible.  That appears to be what we have here.  It is a great piece of Northern Minnesota hockey history without a doubt.