Watch List notes:

The Gold Proof Britannia Portrait Collection 2006 a 5-coin Set comprising Gold £25 Quarter Britannias 2006 (5) each with a different reverse design, four of these designs only available as part of this set, S.PGB28, FDC cased as issued with certificate, number 233 of only 250 sets produced

Estimate: 1400-1800 GBP