Posted By:
Al C.risafulliHi Neil:
I collect them. I like the R303Bs, mostly because they're much less scarce than the R303As. 
The R303B set is also smaller, numbers-wise.
I agree that they're gorgeous cards. I have a bunch at SGC now.
In terms of grading problems, they are on VERY light stock, so they're subject to corner issues. They also often have pinholes, so look closely - and also look at the backs, because sometimes they have scrapbook damage. Essentially, if you can find these in EX or better, you're in pretty good shape.
Interestingly enough, it is on the R303s that you can see the only evidence of Goudey's 1937 purchase of the assets of National Chicle. The backs of the R303s use the artwork from the 1936 National Chicle R344 Rabbit Maranville "How To" booklets. These booklets were initially included in the high number series of Batter Up cards.
One thing that's very interesting - I don't think anyone has conclusively figured out what the R303s were premiums FOR. There are, to my knowledge, no advertising pieces that indicate what you'd need to redeem in order to receive a picture. Part of me, however, likes to think that they were used as premiums for 1938 Goudey Heads Up wrappers. But I only like to think that because I love 1938 Goudeys. 
-Al