Vintage Cast Iron / Steel Railroad type wheel measures around 3-3/4" Wheel Dia. about 5" Dia.at the Flange This is probably from cart used on a railroad. mine, sawmill or factory  

The wheel is very rusty good for display 
 
 
 
[Please Look at all the pictures they are part of the description]
                                                                                                           [B1-F1-AV-S1-2]