It was a practice for kings to donate gold and similar riches on their birthdays and special days. There could've been many reasons behind such a practice - some genuine and some not-so-genuine. Well, here you see a frame where such a balance hung.
Even now a similar practice happens. Only reversed. The common man donates (bribe is illegal in India) all his money to those in power to get anything and everything from birth certificate to death certificate.
Pixelated at: Hampi, Karnataka