Quoted from hoov:
Need a nice 2-slot coin entry plate - 10c & 25c for my Sing Along ('63 - '67 GTB's)
Did they come with a 2-coin slot setup? All the ones I've ever seen (including mine) came with 3-coin slots? Just curious.
Also noticed that one Sing Along that's on the IPDB shows it with the newer style coin entry plate with the back-lit plastic coin labels (BELOW).
In checking the database, looks like Sing Along was the last Gottlieb game that used the old-style (no plastic) entry plates (BELOW). Maybe they switched over in mid run?