They are a 50 card set and Dave had wondered in his post if they might have been issued in two series since he only had cards numbered in the first 25. On flipping through mine I discovered I had about an even mix of cards from the first and second half of the set. On looking at the backs though I noticed something that might lend credence to the two series theory.
The cards on the left in the above photo are from 1 to 25. The cards on the right are all from 26 to 50. Not sure if this is significant, but the reversed color scheme is noticeable.
I've got about half the set now, though a few have dinged corners. I'll add this to my list of kind of fun, random sets I'm working on, the colorful borders have drawn me in.