FROST, John II (Grimwade p.516)

[silverly]

8 January 1799 John son of Joseph Frost was apprenticed to David Buckler London clockmaker.

9 January 1809 John Frost admitted a free clockmaker.

[dognose]

Recorded as 'FROST and SON', Sword Cutlers etc. of 11, Air Street, Piccadilly.

Source: Johnstone's London Commercial Guide - Corrected to 31st August 1817 - Andrew Johnstone - 1818

The "and Son" presumably being William Frost.