"Diverted to Ordinary Mail./Air Mail Fee will be refunded by/British Post Office on application", bilingual "POSTAGE STAMP LOST/IN TRANSIT" (2), boxed "SHOP CLOSED" in red, "ADVERTISED/UNCLAIMED" and other returned or undelivered markings, 1954 air crash with unframed "DAMAGED IN/PAL-AIRCRAFT CRASH"; a very interesting selection. (20)" /> cover 1921-70, a selection of covers showing a variety of instructional marks including "B.P.O. TO C.P.O.", boxed<I> "Diverted to Ordinary Mail./Air Mail Fee will be refunded by/British Post Office on application"</I>, bilingual "POSTAGE STAMP LOST/IN TRANSIT" (2), boxed "SHOP CLOSED" in red, "ADVERTISED/UNCLAIMED" and other returned or undelivered markings, 1954 air crash with unframed "DAMAGED IN/PAL-AIRCRAFT CRASH"; a very interesting selection. (20) | Christie's