Unbranded 2 A 16-1/2" Od.  2 Groove A Belt Pulley/Sheave 1-15/16 Bore.
The outside dia. is approx. 16-1/2 inches this is pulley is probably off a compressor or something along that line. 
 
 
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]  
 
                                                                                                          [B1-F1-R4-S1-1]