Springfield Facsimiles blocks of 4, early set of 12 with Tasco envelope, each block stamped FACSIMILE on the verso. This was the original “complete set” (not) packet from 1934, which was later corrected to a set of 14 in 1941. The blocks were offered separately from the single sets. They weren’t offered in the famous TASCO educational booklets until 1941. See the full story of the Springfield Facsimiles at https://www.trishkaufmann.com/items-for-sale/philatelic-literature/literature?filter=springfield $75.