2 different drive wheel patterns from RRSC burbank.  These are master prototypes, never put into production or not shown in the catalog.  Part#B-7056 written on one of the patterns.
8 1/4" OD tapering down to 7 3/4"OD, thickness .85" to .86", inside crank/axle center is approx 2 3/4" x 1.78".  The Aluminum castings can be used to make a master pattern board with. 
These are unfinished castings of the original patterns.  You finish machining the back flat, and polish up the surface, then mount to an Aluminum plate which creates a Master Aluminum
 production board to last many lifetimes of making castings at the foundry.  Sold As-Is.


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