St Vincent - Union Island 1987 Locomotives #7 (Leaders of the World) 50c Canadian National Class U4-a se-tenant imperf die proof in magenta & cyan only on Cromalin plastic card (ex archives) complete with issued pair. Cromalin pro……Details Below

St Vincent - Union Island 1987 Locomotives #7 (Leaders of the World) 50c Canadian National Class U4-a se-tenant imperf die proof in magenta & cyan only on Cromalin plastic card (ex archives) complete with issued pair. Cromalin proofs are an essential part of the printing proces, produced in very limited numbers and rarely offered on the open market.