1925 UNDERPAID MAIL MONTE CARLO TO KENT DUE TO INVALID USE OF FRENCH STAMP. Post card (slight soiling) from Monte Carlo to West Malling, Kent with French 60c, invalid for use and uncancelled, alongside U.K. "3D/I.S." charge mark and 3d postage due cancelled WEST MALLING 21 OC 25. Unusual usage. (Ref 105228).