A souvenir from Berry Hill

A friend called today with a small gift as he knows I am interested in bricks, especially those from North Staffordshire. This tiny special brick with a really deep frog (more than half the depth of the brick) was made as a souvenir of the visit to the works by William Hancock, the Lord Mayor of Stoke-on-Trent 1961-62. It is inscribed on the side of the brick:

William Hancock
Lord Mayor 1962

I wonder whether it was intended to be used as an ashtray?