Watch List notes:

8 x Silver Proof Medallic First Day Covers, comprising: County Cricket Centenary 1973, 16th May 1973; Royal Wedding of Princess Anna and Mark Philips 1973, 14th November 1973, post-marked Westminster Abbey; Robert the Bruce 1974, 10th July 1974, post-marked at Dunfermline Abbey; Owen Glendower 1974, 10th July 1974, post-marked at Machynlleth Parliament House; Henry V 1974, 10th July 1974, post-marked at Gwent, Monmouthshire; Edward the Black Prince 1974, 10th July 1974, post-marked at Canterbury; The Railway Sesquicentennial 1975, 13th August 1975, '150th Anniversary of the World's First Passenger Train', post-marked Darlington; and Day of the Concorde 1976, 21st January 1976, post-marked Heathrow Airport and Muharraq, Bahrain.
(Estimate: 70 - 100 GBP)