ruby hone, what is it worth and can I use it?

I have this ruby hone, I haven't found much info on it.
anybody have any idea what it's worth, if it is usable, and what sort of grit it would compare to?

 

Maybe if you crack it open you'll find rubies inside.

 

No clue but I'd be hesitant to use with with all of those pits in it.

 

I know nothing about straights or hones, but happened upon this thread over at B&B (hope there's no issues with linking to another forum).

At post #9 mparker writes:

 

Thanks for importing that quote, brumble. good stuff there

 

I sent the link to my buddy Phil (gunner on here) and this is what he replied to over an email:

"Eric,

It's a Swaty hone. Swaty made them for a lot of companies. It looks identical except for the name. It's a barber hone and about a 10,000 to 12,000 grit Made in Austria I believe. Worth about $20 since it doesn't have the swaty name on it.

Phil"

Hope this helps, Bong.