Great Britain SG 8 Mint 1841 1d red-brown block of 6

1841 (late Feb) 1d red-brown on blued paper from plate 23, right marginal block of 6 (2x3) with large part inscription, lettered FK-HL, imperforate with good to huge margins showing trace of adjoining stamps at top, brilliant o.g. (three stamps unmounted). Tiny scissor cut between GK and HK does not detract from this rare and very beautiful block. An exceptional and highly desirable showpiece. Spec B1(1). - P267001843