St Vincent - Grenadines 1987 Locomotives #8 (Leaders of the World) $2 Chicago Burlington & Quincy Pioneer Zephyr se-tenant imperf die proof in magenta & cyan only on Cromalin plastic card (ex archives) complete with issued SPECIME……Details Below

St Vincent - Grenadines 1987 Locomotives #8 (Leaders of the World) $2 Chicago Burlington & Quincy Pioneer Zephyr se-tenant imperf die proof in magenta & cyan only on Cromalin plastic card (ex archives) complete with issued SPECIMEN pair. (SG 534a). Cromalin proofs are an essential part of the printing proces, produced in very limited numbers and rarely offered on the open market.