Found at Glenboig Union Fireclay Works.

There are additional letters and numbers to the normal Glenboig trademark – I cant make them out but they could begin ZC or ZG then numbers.

Glenboig Union Fireclay Company, Glenboig, Lanarkshire.

Alternative brickworks include:

  • Glenboig Star Fireclay Works, Glenboig, Lanarkshire.
  • Glenboig Fireclay Works, (Old Works) Glenboig, Lanarkshire

Below – Widest diam 4 1/2″, hole diam 1 1/2″, depth 1 1/4″

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