Posted By:
Michael HoltMost places I have looked at have the first baseball set from O-Pee-Chee as the 1937 V300 set. A pretty complete listing of old O-Pee-Chee sets can be found at:
http://pages.infinit.net/apratt/1937.htm
The only 1933 set I know of with 50 cards in it is the "1933 R308 Orbit Gum Company Tattoos". The "1933 E137-19 Zeenuts" had 48. Which are the only ones that are close in set length.