I know the coil looked pretty good when I got it, so good that I didn't notice it right away until I was getting ready to restore it. But it really shouldn't be there, and isn't original to the game.
Bit easier to see in these pics. It's just plopped down over the wires that lead to the knocker jones plug. I didn't trace the wires to see where they go though. I traded the game before I did the restore, so didn't resolve the mystery.
2013Oct18 002.JPG
2013Oct18 003.JPG
The game was '52 Happy Days, but I've not seen a picture of the bottom board for another one to compare.