C1944 Tri-Censored Cover to Melbourne from Watchmaker in Neuchatel franked 1f Pfyffer showing brush mark (at centre tending to the diagonal) from application of copper sulphate solution used by the Germans seeking secret messages. Censor tapes of Germany, USA & Melbourne affixed. An important item for the Censorship specialist. [A similar item (only example recorded by Vendor) sold in our 2013 Perry Collection sale for $440+.] (Image1)

Estimate AU$130