1985 (07) Royal Mail - Illustrated Cover - Royal Mail, 350 Years, 1635-1985, London Post H/S

Unusual Illustrated Cover - No idea whatsoever who produced it....... I've never seen it before......

Royal Mail, 350 Years, 1635-1985, London Post H/S.

This H/S is know to exist on a Post Office cover as an Official, which I don't think is this one..... Has an extra 17p stamp which I 'believe' is from the Discount Booklet....

Code: 63424