Found at Castlecary Fireclay & Lime Works, Castlecary (Weir)

I believe this brickmark to say GEM IRR but it may say GEM 1 RR  – also note the difference in  size and shape of the last 2 ‘R’s

Castlecary Fireclay & Lime Works, Castlecary, Stirlingshire.

Now then – yet again I think this mark could relate to this brick being manufactured for a foreign railway system.  See the following 2 links for similar thoughts.

South American Railway Systems

Indian Railway Systems

Below – It is very possible that IRR stands for Iraqi Republic Railways although the company only changed to this name in 1958. I would, however, favour a connection to the Indian Railway network.

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