1946-54 range of 78 stamps (26 singles, two pairs, 14 strips of 3 and one se-tenant block of 6 (SG 268a)), of which 60 are c.t.o. (some very light !) and the remainder unused (all but one with full unmounted o.g.). Sadly not a complete range, but known to have come from a Post Office archive, and assembled from UPU "Specimen" distributions. The 1946-48 issues are all unused (inclg 1946 "Peace" set in vertical strips of 3), but most issues from June 1949 to Sept 1954 (beginning with SG 231 and 223a) are c.t.o., the only visible exceptions being SG 263a (strip of 3) and 264. Lightly toned gum but a most interesting and really rather important group, which collectively allows the conclusion that all the c.t.o. stamps are "protected" by the SAME 27.5mm "G.P.O./MELBOURNE", cds with FIXED DATE "24 JE" (and only vague marks in place of a year). The highlights are the SG 268a se-tenant block of 6 (including one complete strike), and the strips of three, inclg Postage Due 1946-57 7d and 1953-59 1s and 2s. [Bendon, "UPU SPECIMEN STAMPS, 1878-1961", p. 77, refers to the resumed practice of cancelling stamps for UPU distribution "from April 1949.. until August 1954", but did not attempt a listing, or give details of the cds, because of the lightness of the impressions. It remains unclear whether these c.t.o. examples can be distinguished from similar examples included in sets for sale to collectors, but the 60 c.t.o. stamps in this selection were certainly sent to Bern for UPU distribution as "Specimens"].