Is this coti?

[Calcium]

http://img248.imageshack.us/i/1111cey.jpg/
http://img63.imageshack.us/i/2222eqb.jpg/
It's 10x2x1.5".The seller says it's a stone for sharpening a microtome knife.

 

[screaming_pig]

err no pics!!

 

[Utopian]

Yes, it's a coticule. The photos look like a coticule and they are used to sharpen microtome blades.

 

[Calcium]

Picked it up for 33$. =)