Selection of First Day Covers (FDC) from the WWFs Conservation Stamp Collection
There are 5 exceptions to the 4 stamp/value rule: Set 003 has 7, set 013 has 2, set 016 has 1, set 064 has 1, and set 120 has 2. 035, Coral Life, Marshall Islands - FDCs only. 003, Birds of Prey, Hungary (4 of 7 values) - info-sheet and FDCs.