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 gave it a try with just water and didn't produce an edge that would pop arm hair after 10min. Using the dilucot method I got it to pop hairs but not very well. I'm going to give it more time on slurry tonight till it's good then I'll test shave it.