This is a Solid Brass Wallet Chain by Obbi Good Label. It is a 'cuban' design attached to a belt hook and trigger hook on each ends. Use for securing your wallet or as an accessory commonly for leather long wallet, but not limited to mid and short leather wallets. 

Obbi Good Label TYPE 2 style

Full 100% Solid Brass 
O-Ring connector on hook-end
Belt-Hook is 6cm long
Trigger-Hook is 5cm long
Chain length: 40cm

Note: The 'fish-hook' looking is actually a Belt-Hook. The correct way is to go underside your belt and then hook it down. This will serve the purpose of securing your wallet. 

Used example below shows the Brass aged and natural patina.