Goldmine has even contradicted itself in its numerous price guides, but based on my reading, the PG-suffix signifies a (budget) reissue - not the original Feb. 1975 US release, which is KG 33371
See also
http://forums.stevehoffman.tv/threads/records-price-codes-the-definitive-thread.364593/
Like many of Moses Asch's Folkways releases, never announced in Billboard. First reviewed as a new release in Volume 28 of Down Beat magazine, cover date December 21, 1961 - Chicago, Illinois, U.S.A.