Watch List notes:

(g) George VI (1936-1952), Proof Half-Sovereign, 1937, by Paget and Pistrucci, bare head left, rev. St George and Dragon, edge plain, 4.00g, 12h (W&R 442; Schneider II, 673; Spink 4077), brilliant, practically as struck.
Provenance
From the Quinn Collection
Purchased UBS (Geneva), 18 March 1991 - CHF450
, ,
NGC PF64 CAMEO (Certification #5879377-012)
, https://www.ngccoin.com/certlookup/5879377-012/64/
Estimate: £500 - £800