1983 UNDERPAID MAIL JERSEY TO GUERNSEY/MIXED DECIMAL AND PRE DECIMAL ISSUES.. Envelope Jersey to Guernsey with Jersey 5p and 5d (pre decimal) with only former cancelled JERSEY 6 JY 83 - the latter noticed with "STAMP INVALID/12 TO PAY" chargemark. Guernsey postage dues 2p and 5p x 2 cancelled GUERNSEY 8 JY 83. Philatelic but unusual usage. (Ref 77602).