Great Britain - Day 4

1840 2d blue pl.1 AB-BG used block of 12 with red MC cancels, and pl.2 AA-BF used block of 12 with black MC cancels. Both blocks have margins touched in places and faults but are of exceptional rarity, being the largest known used blocks of this issue.

Expertise: Cert. Brandon (2018, for each block) and Karl Louis Provenance Certificate for the pl.2 block (2006).

Provenance (pl.2 block): Martin-Hurst (Harmers 1941); Stanley Gibbons (1978).

Provenance (both): "Mayflower"