9" Gear Wheel

Gear wheel of unknown/unverified provenance.
I received 3 of these with a lot of astro-gear.  All three are at auction here listed separately in separate auctions.  I only took a picture of one and used that picture for all three auctions.  All three gears are identical in size, specifications and condition.  They are as new.
Note that this not a gear set.  It is the wheel only. 

This gear shows no damage and appears to be in perfect condition.
The Specs:
O.D. = 9"
Central bore = 4"
Thickness = slightly under .5"
Number of teeth = 360

There are 6 holes drilled through on a standard symetrical 6 hole pattern on a 3.5" radius.  Three of the 6 holes (every other one) is tapped 1/4-20 through.

Thanks for checking this out!