Watch List notes:

(x) Government of Brunei, a group of four progressive proofs for the 100 ringgit, serial number A/5 025001-A/6 275000, ND (1972-88), blue and purple, Sultan Hassanal Bolkiah Mu'izzaddin Waddaulah wearing uniform and songkok headgear at right, reverse, Omar Ali Saifuddin mosque in Bandar Seri Begawan, plus three progressive proofs for the same note, (Pick 10s, KNB10S, TBB B110s), pencil date 'Aug 83' in top margin of complete note, good extremely fine and rare (4).

Estimate: £800 - £1000