Hello there Pompey Welsh,
I think the address is possibly "Tan-y-rhiw" - this is on the current OS map, and looks like a farm about 2 km north of Cilfrew. There were tinplate works in Cilfrew (2 km) and in Aberdulais (about 4 km).
I only just stumbled across your question - sorry for delayed reply.
Regards, TAHMV