Watch List notes:

(g) George V (1910-1936), Proof Half-Sovereign, 1911, by Mackennal and Pistrucci, bare head left, rev. St George and Dragon, edge milled, 3.98g, 12h (W&R 418; Marsh 526A; Spink 4006), brilliant uncirculated.
Provenance
The Apollo Collection
, ,
, NGC PF65 (Certification #5880295-004)
, https://www.ngccoin.com/certlookup/5880295-004/65/
Estimate: £400 - £500