Watch List notes:

Aviation: Concorde, two silver 3 medal sets replicating Concorde stamps (6), 1969, 4d, 9d and 1/6d denominations, all showing the aeroplane, rev. REPLICA IN FINE SILVER OF THE CONCORDE STAMP ISSUED BY THE GENERAL POST OFFICE LONDON, 1969, one group numbered 0154, the other numbered 0286, in red cases of issue, as produced (6)

Estimate: 20 - 30 GBP