Watch List notes:

(g) Elizabeth II (1952-), Proof Sovereign, 1989, '500th Anniversary of the Sovereign', by Sindall, Queen seated in King Edward's chair, rev. Tudor Rose, edge milled, 7.98g, 12h (Marsh 313H; Spink SC3), brilliant uncirculated.
NGC PF70 ULTRA CAMEO (Certification #5880286-010)
, https://www.ngccoin.com/certlookup/5880286-010/70/
Estimate: £800 - £1,000