I'm using a leather thumbring I made, I ordered a brass one made by Grozer but it is on a slow boat from England.

Made a video.... before my horsebow arrived...

http://www.youtube.com/watch?v=U9ziYJ5vV6M

I call it a thumb locator, it just helps me keep my grip consistant.

Here are some of mine:

 
 

Very nice, I particularly like the bottom one.

Who made them?

I did. Thanks for the kind words  

Take a look at Grozer. They have all kind of different kinds and also the choise between base models, bio-composite and bio-composite extra.
Most of the time Grozer can deliver particular bows from stock! I shot and owned different bows from them and they are made very well and shoot like hell. I love their Assyrian: it looks very innocent, but shoots terrific! But remember: most of the horsebows do have a handshock.

Enjoy:  http://www.grozerarchery.com/index_m.htm

QuoteOriginally posted by iohkus:
Hope to have a Saluki SOME day ...............    

Me too, love the look if their bows.