Watch List notes:

The Hardcastle Collection | PROOF 64 ~ [Top Pop] | British Administration, Ceylon (Sri Lanka), Proof 1/48-Rix Dollar, 1802, in gilt-copper, Elephant left, date below, rev. CEYLON GOVERNMENT, 48 in centre, 6h (Pridmore 83B; KM 75), brilliant uncirculated, in NGC holder, graded PF64 (Cert. #5878623-003) [Tied 1 of 2 ~ *Joint Finest*].
https://www.ngccoin.com/certlookup/5878623-003/64/
Estimate: £600 - £1,000