1972 INVALID STAMP, GUERNSEY ISSUE USED IN THE UK. Envelope (228 x 102) to Minehead Somerset with 2½p Guernsey incorrectly used in the UK, cancelled MINEHEAD date stamp 11 APR 72, not accepted with boxed "TO PAY/873/CHANNEL ISLAND STAMPS NOT ADMISSIBLE WHEN POSTED ON UK MAINLAND" with 5p postage due cancelled MINEHEAD/SOMERSET 21 APR 72. (Ref 111220).
