3 Pence - George V 2nd issue, incl. Maundy

The shift to .500 fineness in 1920 was a direct consequence of the Coinage Act of that year, itself driven by the post-WWI spike in silver prices that had made the old .925 coins worth melting. The transition was abrupt enough that 1920 saw both standards struck before the old blanks were exhausted.

Maundy pieces of this type retained the finer alloy fractionally longer in public perception than in reality — by this date they were already .500 like their circulation counterparts, a fact that quietly irritated traditionalists at the time.