Watch List notes:

(g) Elizabeth II (1952-), Proof Two-Pounds, 1989, '500th Anniversary of the Sovereign', by Sindall, Queen seated in King Edward's chair, rev. Tudor Rose, edge milled, 15.98g, 12h (Spink SD3 [4262]), brilliant uncirculated.
NGC PF70 ULTRA CAMEO (Certification #5880286-009)
, https://www.ngccoin.com/certlookup/5880286-009/70/
Estimate: £600 - £800