Great Britain 1921 1d Die Proof variety, SG357var Anguilla stamps This is a rare letter

This is a rare letter from HG Selfridge

24) notes that only six examples with this overprint (previously unknown and not recorded by Samuel) were released by the National Postal Museum in 1984

very fine unmounted o

Accompanied by a 2001 British Philatelic Association (BPA)  Certificate

Great Britain 1891 (28

Great Britain 1921 1d Die Proof variety, SG357var Anguilla stamps This is a rare letterGreat Britain 1921 1d Die Proof variety, SG357var. A fine stage 5 uncleared example printed in red on white gummed multiple cypher watermarked paper (watermark inverted), numbered "275" at top. Offered with original Royal Mint envelope endorsed "Water Marked Paper". A unique King George V specialised philatelic piece. Stanley Gibbons catalogue value: 8,500. Stage 5 shows white lines all round, crossed at the corners and stepped at left opposite the