1873 UNDELIVERED LETTER EXETER TO LONDON WITH ORIGINAL "AMBULANCE" ENVELOPE. Envelope with letter Exeter to Islington London with 1d pl.125 (SG43) lettered OH, tied EXETER/285 duplex MR 1 73, on reverse ms "Not known" and various date stamps. Officially opened and returned to sender in "On Her Majesty's Service/Returned Redirected Letter" envelope from the Returned Letter Office, General Post Office with charge of 1d. Returning envelope slight soiling but unusual to find still together. (Ref 114228).