It was listed by Sandbanks Antiques. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Sandbanks Antiques has dated this 1937 Gold Sovereign to the 1930s.
George VI, 1937 Gold Proof Sovereign
Obverse: Bare head facing left, with initials HP below neck for Humphrey Paget. With latin legend surrounding:

GEORGIVS VI D:G: BR: OMN: REX F: D: IND: IMP:
Reverse: St George and dragon facing right, date in exergue, B.P. to upper right of exergue, edge plain
Mintage of 5,501 pieces
Weight (grams): 7.98
Pure gold content (grams): 7.3224
Fineness: 916.7
Dimensions: 22 mm Diameter
Encapsulated and graded by PCGS PR66+ CAMEO -388523.66+/35686351
Population 2
Pop Higher 2
PROVENANCE: From Private UK Collection
Sandbanks Antiques has dated this 1937 Gold Sovereign to the 1930s.
Specialising in antique silver, gold boxes, gold coins and objects de vertu. Rare fine-quality imperial chinese porcelain, jades, cloisonné
You can view the stock and full dealer information on the Sandbanks Antiques Profile Page