So finally after many weeks my purchase has arrived. It came from Germany and the seller said he lives close to the Belgium border. It looks to be very old and after lapping it, it appears to be a nice piece. Some of the lines running through it actually look much smaller and fainter then before lapping. It took a good hour on my DMT 325 to get it flat, then I used wet sandpaper and finally a coticule bout. you can see the back side of the stone and it fits really nice in the hand. It is roughly 4 by 4 1/2 inches and is one inch thick. I'll try it out tomorrow when I have some time.