It looks like RABAB PARIAMAN musical instrument of Pariaman region in West Sumatra. A round container made of coconut shell covered with cow skin or goat skin. Suryadi, Leiden University (https://www.universiteitleiden.nl/en/staffmembers/surya-suryadi/publications#tab-2)
Reference: Suryadi, S. (1998), "Rabab Pariaman". In: McGlynn John H. (Ed.), Language and Literature; Indonesian Heritage Series. Singapore: Archipelago Press. 66-67.