This fine figure of Amitayus or Aparmita, the Tibetan deity most associated with longevity, is seated cross-legged and like a Buddha, is seated atop a double lotus pedestal. Amitayus wears a high and elaborate crown, ample jewellery, and a vase of longevity resting on the lap.
The stylistic features and proportions suggest Tibetan rather than a Nepalese origins. Coating the bronze with black lacquer and then gilding it was unusual in Nepal and more common in Eastern Tibet or even Bhutan (Pal, 2003, p. 166).
Amitayus is considered one of the Five Dhyāni Buddhas (together with Akṣobhya, Amoghasiddhi, Ratnasambhava, and Vairocana) and is associated with the western direction.
The image here is in fine condition and has wear and a patina consistent with an 18th century dating.
References
Pal, P., Art from the Himalayas & China: Asian Art at the Norton Simon Museum, Yale University Press, 2003.