Info on an Oil Stone please!

Hello all,

I'm in search of finding out any infomation ya'll can share about this perticular stone I've acquired:

http://i307.photobucket.com/albums/n...g?t=1262992742



http://i307.photobucket.com/albums/n...g?t=1262992816


http://i307.photobucket.com/albums/n...g?t=1262992863

The Stone was my Grandfather's and looks as it has never been used. Thanks for any comments/info...

hhmmmm, there is mixed info about the Crystolon.
Maybe you see for yourself here

Thanks, I figure I probably won't use it for any razors and if I use it at all it'll be for knives...