I have a large number of variants of the good old run off the mill West Yorkshire Regiment OR's cap badge, as already pointed out generally there are variations of the tail and legs (joined at the front or not). Other common variations are the horses main, (pointed or smooth) the scroll (there is a thread on here somewhere regarding West Yorkshire scrolls so I wont elaborate) and of course the horse its self, either slim and gracefully or fat and stumpy.

As a rule I keep away from the non voided leg versions (this is the version of the horse you see in the volunteer re-strike badge), I'm not saying that the non voided badges are all re-strikes, they may be a manufacturers variation (particually with only non voided rear legs) and are usually found on the less gracefully fatter horse which is only found on a slider.

Regards,
Marcus