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