The horse riding stick heart.

My granny's great great great granny bought this riding stick some centuries ago. My family believes this one and the one previously published on this blog are related. My father spent years on the study of the resembling horses and came to a logical conclusion:

They must have been bought at the same Athenian market. The shop had been run by the same family of sellers and it was passed on to the sons after each father's death.

I personally don't care about this information. I just want to know WHERE the other half of the heart is.