Lot 341 Canada #7 1857 10d Blue Cartier Imperforate on Thin Crisp Paper, used with light grid cancel, four large to very large margins, extremely fine. Accompanied by a 1970 Alberto Diena certificate (with his initials in pencil on back of stamp) and a 2019 Greene Foundation certificate. Rsv. $1,400. Unitrade CV$2,400.