Cheever & Towie: 1849 envelopes & address (2c) red blk of 6, plus staggered printing blk of 4, classic forgeries from 1860s-80s. F-VF 1 M/9 MNH, almost all 4 margins. Sc 37L1 cat US$6000 = A$8500 for originals. (10) (Image1)

Estimate AU$40