Rare Antique 18th century Ukrainian Zaporozhian Cossack Gun Powder Flask

Rare antique 18th Ukrainian Zaporozhian Cossack gun powder flask with heart-shaped body carved from hardwood, the outer face decorated with carved traditional Ukrainian geometric pattern of raised ribs, the inner face with an iron loop and the chain for suspension. 

 HEIGHT: 21.5 cm (8 1/2 in) 
REFERENCES:
Three very similar powder flasks from the Ukrainians State museums are published in the book: ("Ukrainian Cossack State" by Volodymyr Nedyak) Page: 239. Also similar Ukrainian Cossack powder flask is published in the book Kozaczyzna by Romuald Romanski
The Buyer will be provided with copies of the pages from the mentioned references along with a certificate of authenticity.
CONDITION: In its original condition, showing the age and usage, with a dark patina.