Great Britain 1973 3p-9p "British Paintings", SG931/4var.
A superb unmounted full original gum bottom marginal set of four imperforate imprimaturs of this famous and popular stamp issue. Each stamp is with a "BPMA" (British Postal Museum Archives) handstamp on reverse.
Exceptional provenance as they were released from the British Postal Museum Archives in 2014. Prior to this they were stored in the museum archives in climate controlled vaults since being printed and are therefore in uncirculated mint condition.