Watch List notes:

The Hardcastle Collection | PROOF 65 | British Administration, Ceylon (Sri Lanka), Proof 1/192-Rix Dollar, 1802, in gilt-copper, Elephant left, date below, rev. CEYLON GOVERNMENT, 192 in centre, 6h (Pridmore 87B; KM 73), brilliant uncirculated, in NGC holder, graded PF65 (Cert. #5878623-005) [1 of 1 / 1 Finer].
https://www.ngccoin.com/certlookup/5878623-005/65/
Estimate: £400 - £600