Very old early to mid 1800 (or even older) achenese oil lamp.
The native name of this lamp is "Panjot Gantong", and were not in fashion and extensive use anymore from 1900.
Considering the enourmous patina, this one is very old.
Dimensions: highth 74 cm hanging on the chain and hook, 21 cm without chain. Width 19 cm
Provenance: Dutch market