15c Coral Reefs, Perforation Errors (1830b, 1830c, 1830d). Three Mint N.H. multiples, block of four Imperforate (1830b), top plate no. block of 14 with right block of four and middle top pair Imperforate Between Vertically (1830c), also block of four Imperforate Vertically (1830d), the last two with blind perfs where they must be to create the errors (clearly evident with oblique light), Very Fine and rare trio, quantities listed in Datz include two blocks of four and two pairs of No. 1830c and four blocks of No. 1830d, last with printout of P.F. certificate no. 289859 (with wrong scan)

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