Antique/Vintage Cast Iron Rockwood MFG CO Adjustable Electric Motor Mounting Plate No. 0 
 
 

This is used surplus from a factory [Woolrich Mill] that kept spare parts but no longer needed them.

 
 
[Please Look at all the pictures they are part of the description]
 
                                                                                             [B1-F1-R6-S2-1]