The metal hook on the seath looks like the hooks on the army kanteens.
It's used to hook in an army belt full of holes.
You can see a belt on (the only picture I could quickly find on the net):
http://www.psu-shop.nl/epages/61767985.sf/nl_NL/?ObjectPath=/Shops/61767985/Products/0289Click on the image to enlarge => you can see the holes.
(sorry for the link, can't post images online)
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