Watch List notes:

Sir Josian Mason's Nickel Alloy Trial, undated, SIR JOSIAH MASON'S NICKEL ALLOY, mermaid holding mirror facing left, rev. MADE OF 25 NICKEL 75 COPPER SUITABLE FOR COINAGE, in 5 lines, plain edge, 12h, 6.02g (cf. Tansley 502), pleasingly struck-up, good very fine and scarce.
Sir Josiah Mason (b. 1795), Birmingham industrialist and philanthropist, knighted 1872. The mermaid on the 'coin' was the heraldic badge of his Trust and Mason's College
Estimate: £50 - £80