These are catalogued in the December, 1976 Supplement to the Journal of the Token and Medal Society (TAMS) Journal, Amusement Tokens of the Minneapolis - St. Paul Area by Kenneth R. Smith. In his introduction, Smith says, "The pinball machine craze hit Minnesota's Twin Cities in the early 1930s and, at first, rewarded winners with money. However, this gambling was quickly outlawed. To circumvent the law, pinball machine operators ordered nickel size tokens, most of which read 'good for 5? in trade', but these were also outlawed. The operators then resorted to nickel size (21mm) [tokens] with similar or dissimilar legends on both sides. The complaint against these tokens was that their nickel size implied they were good for a nickel. Token manufacturers then went to a 20mm token, which remained as the principal amusement machine token in the Twin Cities for about 10 years. Tokens of 22mm and 23mm diameter were usually given for five free plays."
The series is very recognizable, however a few businesses outside the area used similar tokens. Smith lists in the area of 1500 in his work.
John in ID