The button by FIRMIN’S is of a style quite a bit older than the Tram Company’s start-up in 1876. I was of the impression that that two piece style open back button had been superseded by the three piece closed back style by that date.
My house is upside down at the moment so cannot consult my reference books!
None the less, a very interesting bit of research done there. Best regards, D.J.
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