One of the letters written to my mother in 1945 says: "Poker may not be your strong point, but then I don't think that Michigan Rummy is either." Not a very cut-throat gambling game, but lots of fun and not demanding, either.
Mom and Dad taught us Michigan Rummy as we grew up and it was a favorite rainy-day family activity, using pennies for the jackpot and pot for each "money card" we hoped we could play from our hands. We had an official set with a tray to hold the pennies for each pot and money card, so we needed only a deck of cards and we were ready to play.
Today the Gorgeous Game Girls in my town play Michigan Rummy when we want to laugh and talk. No official set, just little bowls to hold the piles of pennies for each money card (especially the 9 and 10 of spades). The money cards we use differ from the Pressman Toy and Brikker & Brett versions, however. There was no real rummy angle to this game when I played as a child, and we don't play it as "rummy" today either.