What does my horses brand mean?

[thechocolatehorse]

Hi everyone, I recently got an ex polo pony and on his hindquarter he has a brand of the number 63. Does anyone know what this means as I'm completely lost when it comes to brands! Thanks

 

[Spring Feather]

Argentinian polo pony? It's usual for all registered horses to be branded over there. It is most likely the breeders number.