[TowerTalk] Please Help ID thrust bearing

[Ed-W4EP]

I have a thrust bearing I'm going to list for sale on QTH.com. It is big,
heavy, 
about 6.5" across, zirk fitting on collar, for 2" mast. I have a photo at:
http://albums.photopoint.com/j/ViewPhoto?u=931735&a=7487780&p=25497223

Can someone tell me the make/model number? 

Thanks a bunch!
Ed W4EP

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