Lot 6202 373rd. Heinrich Köhler Auction - 6202

1864/73, Steamer 1 penny green, proof from an engraved die on thin card (30x29mm), without gum, a very fine and unique item Provenance: ex collection E.F. Hurt                      described in  S. Ringstrom and H.E. Tester "The Private Ship Letter Stamps of the World - Part 2" page 21