Found by : Jeffrey Lawton
In jeffrey's book, he explains that Spottem is a common name used on the "Ohio Dime Games" (Barrel-o-Fun's and Fun Spot's).
Apparently people rescreened the backglasses to make all the variants of these machines appear to be the same thing.
You can figure out which game you have by looking at the cabinet style, artwork, and layout of elements on the backglass.
Note that the Fun Spot games are non-replay scoring versions of the Barrel-o-Fun games.