25 New Pence - Elizabeth II Silver Jubilee, Machin pattern

Arnold Machin's rejected pattern for the 1977 Silver Jubilee crown is one of the more intriguing dead ends in postwar British minting. The Royal Mint ultimately issued the Jubilee crown with a design by Richard Guyatt, leaving Machin's submission unissued — though examples were struck and preserved, as was standard practice for rejected patterns entering the Mint's own records.

Machin was already the dominant figure in British coin portraiture by this point, his effigy of Elizabeth II having entered circulation on decimal coinage in 1968.