Hello John !
Sorry but I don't have information about your plaque.
I have found only the following information :
The building of the Centro Mercantil, Industrial y Agrícola yet exist, the address is Coso Street , 29. It was not a casino it was the Mercantile, Industrial and Agricultural Center of Zaragoza .But I suppose that there was a Card Room
It is a modernist building and was constructed in 1914 for the Architect Francisco de Albiñana.
Fran
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