Takht-i Kuwad is an archaeological site in Tajikistan, probably the original findspot of the Oxus Treasure, which dates from the 6th to the 4th century BCE.
Oxus Treasure in the British Museum >> https://www.britishmuseum.org
Perfume / oil gold flask in the shape of a fish, with a loop on one side. Achaemenid, 5th-4th C BCE.
Height: 6.5 cm, width 5 cm, length: 24.5 cm, Weight: 370 g
British Museum 123917
The fish is long and narrow, the loop soldered on one side could have been used to attach the chain holding the bottle cap.