1c-15c "China Clay" Paper Varieties (331 var-340 var).
Mint N.H. complete set of singles from 1c-15c, incredibly rich colors on paper which is slightly different than normal, 3c and 13c with partial imprint in selvage, 6c slightly oxidised, each accompanied by 1992 P.F. certificate specifying they are "China Clay" paper, 2c-4c for a larger multiple and 13c-15c photocopies for a larger multiple, offered on their own merits due to the controversial nature of China Clay paper -- because of the White-Liston controversy, the P.F. will no longer certify these, although all experts agree they are printed on distinctive paper
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