17.25" tall Base 6.25"x 6.25"
Thank you for contacting Mearto. This is a brass statuette of a bodhisattva holding a lotus flower. The lotus indicates that it could be the deity Padmapani, a manifestation of Avalokiteśvara. The style appears to be Southeast Asian or perhaps Indian. I have not seen this particular style of headdress. It is similar to Thai headdresses; I linked to an example below. Other aspects of the piece, like the jewelry and indentations look similar to Indian sculptures; see link below.
As for dating, the likelihood is that it was made in the last two centuries, because there are so many reproductions out there. However, you might send an image to Sotheby’s or Christie's to see if they bite. The service is free; they won’t give you information other than a yes or no on whether they’re interested in selling it. I added links below to their pages.
Below these are links to hammer prices of bronze statues of similar size and condition to give you an idea of the market. My valuation is based on these.
Thai headdress example: