Watch List notes:

British Coins, Victoria, Smith's Decimal Pattern One Centum, 1846, struck in silver, by Marrion and Gausby, Birmingham, young head l., hair tied back, MARRIAN & GAUSBY.D.BIRM. below, toothed border within raised rim both sides, rev. SMITH ON DECIMAL CURRENCY, ONE / CENTUM in centre, date below ornament either side, edge plain, ↑↓ (P. p.479, note 2; cf. F.823, note R19), certified and graded by NGC as Proof Details, Cleaned, very rare
(600-800 GBP)