A mint and used study of the overprint including Johore Postage Due 1c. to 12c. in marginal blocks of twelve (4x3) with one in each showing second character sideways, Straits 8c. with overprint inverted, Negri Sembilan 1c. block of eight (4x2) with one showing second character sideways, Perak 2c. (Type 20) on 5c. block of four, vertical pair and two used singles showing grossly misplaced surcharge, two mint singles with surcharge and overprint inverted and a mint single with overprint inverted, Trengganu mint 1c. to 35c. and Malayan Postal Union mint 3c. pair with grossly misplaced overprint and 9c. (used) and 10c. (mint) blocks of four with overprint inverted. Fine. Cat. £1800+