This has got to be the coolest bagatelle style pinball game ever! It is a "Three Keys to Treasure" bagatelle game by Marx toys. The patent is from 1953, but the toy is probably from the early 1960s. I've tried, but I can't find the commercial mentioned on the box.
First off, this thing is huge. It's about 2 feet long, and over a foot high when the legs are attached. Second comes the "Three Keys" part. This is a three part puzzle you have to solve in the game. When you have marbles in all three key slots, you can move a lever, that opens a door to reveal a prize!
The game works perfectly, and all the original toys appear to be present (they're all here, I assume they're all original). The box is slightly worn, but overall in very good condition. There is some scuffing or something near the ball launcher, but that's as close to damage as we can find to call out.
One cool looking toy, and you can still play it too.