FS - 3" black trackball in metal housing

[PileOfMonkeyCrap]

Under 4 hours left on this auction for an interesting trackball.  Was used at work connected to a PC as a pointing device/mouse.  3" and in it's own metal case.  Has a 25 pin male connector built into the case also.  

I've had it for a year and it's been sitting in my parts bin.  Did some organizing and decided to sell it.  Can't tell you much about it other than that.  Should be opened (via 4 screws on top) to have the bearings lube.  But ball does roll and no signs that it doesn't work.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=13718&item=3260189067

Thanks for looking.