"7. Same-Marble Machine Hold to Be "Slot Machine" Under Statute Though Operated for Amusement. Evidence examined, and held that a five ball marble machine which can only be operated by inserting a nickel into a slot, which releases five steel balls into a chute, which the operator would shoot by releasing a plunger on the machine, which balls, when shot, could strike several pins or objects within said machine, depending upon skill or chance of the operator, and which is operated for amusement, comes clearly within the provisions of this statute; and the operation of said machine is a misdemeanor."

The above is from the following link: http://law.justia.com/cases/oklahoma/court-of-appeals-criminal/1941/52893.html

Regarding an Oklahoma Court Case, "Couch vs. State" 1941.

Sounds like a Pin Ball machine in the earlier definition of a Pin Ball machine, i.e., the object was to knock down pins with metal balls.