Found at Castlecary Fireclay & Lime Works, Castlecary.

Castlecary Fireclay & Lime Works, Castlecary, Stirlingshire or the Glenboig Union Fireclay Company which took over the Castlecary company and works in 1936 (Via General Refractories, Sheffield) and continued the ‘GEM’ and ‘Castlecary’ brand names.

FCSO – Probably made for the South American railway network as per this link – Click me



25/07/2020 – Update from Juan Rodrigues, Buenos Aires – “FCS is Southern Railway, FCSO means South and West rail. The Southern Railway and the Western Railway merged in the 1930s”

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