Circumstantially, you can surmise that there are horse farms in Turkey, whereas there is but one pig farm, so if they are boar then the fibers would have to be imported and would therefore be expensive.
I guess I'll know if it's Horse by seeing if the bristles split after lots of use.
What about the other horse brush brands?
The only other one I see are the brushes on Gifts & Care. Is that a good site to buy from?
Just ordered one, will post my impressions about it when it arrives, but don't expect much for the price.