Unbranded 6-5/16" Od.  4 Groove B Belt Pulley / Sheave 1-1/4" Bore. 

The pulley has a 1-5/8" bore with a sleave with a 1-1/4" bore see pictures.
 
 
This is surplus to a now closed factory that kept spare parts on the shelf the boxes may show shelf wear and have some dust on them.
 
 
[Please Look at all the pictures they are part of the description]  
 
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