Sale #49 Special catalogue Australia, USA – Wells Fargo

Südaustralien - Dienstmarken allgemein: 1895 2½d. violet-blue, perf. 13, surcharged "O.S." (Type O2)
1895 2½d. violet-blue, perf. 13, surcharged "O.S." (Type O2) and used on "O.H.M.S." envelope from Adelaide to Vienna, AUSTRIA in 1896, tied by "CORRESPONDENCE OFFICE G.P.O./NO 12/96" c.d.s., with '20.12.96' arrival dater on the reverse, fine. This stamp optd. "O.S." is listed by SG as used on May 12th, 1897 earliest. This cover shows that it was used months earlier.