Mauritius SG257b/ba 12c Perf 15×14 Block inc Variety Serrated Edge U/M Cat 1785

1942 12c perf 15 x 14 lower three rows of RP with R10/5 serrated edge fine unmounted with cream gum. Ink perf notation on lower selvedge with a small piece of paper stuck over it still very fine and a very scarce multiple. SG 257b/ba Cat 1785 pounds