Christmas, early '60s:
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About 2' long, front to back. 4 "D" batteries.
Flash forward to early '70s, when a new walk home from a new school went right past the House of Billiards, which had (at the time) Wiggler, Suspense, Rock 'N Roll, Expo, Doodle Bug, and Klondike.
I was late for dinner a _lot_ that first winter.
A couple years later, bought my first machine (Pit Stop) from them.