PL.2 MATCHED PAIR LETTERED IC BOTH S.C.16 (SG21) ONE WITH INVERTED WATERMARK (SG21Wi). Fine used 1855 die 2 1d pl.2 lettered IC S.C.16 WATERMARK INVERTED (SG21Wi) with Scottish cancellation, matched with an example same plate, same lettering, also S.C.16 (SG21) but watermark upright. Latter cancelled London '34' Inland numeral. A most unsual and rare matched pair. (Ref 105557).