U-Cards are designated in the American Card Catalog as match folders/covers and all other inserts not previously listed in the book. For that reason, I have used this page as sort of a catch all for different types of cards/collectibles that exist but don’t really fit anywhere else.
The most popular issues in this classification are the Diamond Matchbooks, which featured pictures of hockey players on the exterior of matchbook covers.
1933-34 CCM Brown Border Photos
1934-35 CCM Green Border Photos
1935-36 CCM Blue Border Photos
1936 Pet Cremer Olympia (Multi-Sport/Germany)
1936-37 Providence Reds (U.S.)
1934-35 U9 Diamond Matchbook Silver (U.S.)
1935-36 U10 Diamond Matchbook Tan (Series 1-5) (U.S.)
1937-38 U10 Diamond Matchbook Tan (Series 6) (U.S.)