Auction 309-320 - Europe & Overseas - Day 3

Official 1891 (Jan): 7½ d. on 6 d. brown, wmk. Crown over NSW, perf. 10, an unused example overprinted "OS" in black (7 mm. spacing), showing variety "O" of "OS" sideways (position R47). Perforation imperfection at top left and small thin but only 6'000 stamps overprinted and thus only 50 examples of this variety are possible. Cert. Ceremuga (2013).