Lot 40488 – 1855-57 1s Green in irregular block of 13 on large

1855-57 1s Green in irregular block of 13 on large parcel piece along with 6d lilac, tied by « 30 » London numerals, with London and Derby ds adjacent, trimmed wing margins at right otherwise fine, probably the largest known block (SG £4’700+ for two blocks of four plus singles)