Anyone got an idea where this is from?

its base stamped 25mm ADEN DUMMY DRILL. Its 9" in length

The shell turned up at a house clearance that I was involved in, cannot find much info on the net, I was also wondering is it worth anything to a collector? If so, where would be the best place to sell it?

Its extremely well made from stainless steel, its also quite heavy.

Any info gratefully received.

http://i454.photobucket.com/albums/q...01/aden002.jpg