1961 UNDELIVERED MAIL LONDON TO SWITZERLAND. Envelope London to Bern, Switzerland with 3d Wilding cancelled LONDON 26 JLY 1961, undelivered with Swiss postage due affixed and cancelled circular "T" hand stamp and re-directed back to London with various other hand stamps including circular LONDON S.W.1/R.L. date stamp 3 AU 61 of the Returned Letter Office. Good usage. (Ref 109575).