Watch List notes:

(g) PF68 ULTRA CAMEO | Elizabeth II (1952-), Proof Sovereign, 1979, second head, edge milled, 8.00g, 11h (Marsh 310; Spink SC1 [4204]), some spotting across otherwise brilliant surfaces, practically as struck, in NGC holder, graded PF68 ULTRA CAMEO (Cert. #6295122-001).
Provenance
The Lansdown Collection of Guineas and Sovereigns,
Estimate: £270 - £300