ESC 3571, S.3980.
Bare head.
The key date in British 20th Century silver coinage. Extremely rare in high grades. If this coin were graded within the MS grades it would be a £10,000 coin.
Slabbed and graded by NGC as AU58.
A recent AU58 in the Spink 'Waterbird Collection' sale on 24/09/2019 realised £5,500 hammer.