Impossible to answer without a detailed description of all markings, dimensions, power source, papers, history, etc..
I have sold Greener harpoon guns in the past. The one pictured is an earlier model ahd have sold in the $2000-$3000. Greener also made a percussion model that fired a very large harpoon. It was used for whales and weighed about 50 pounds, was mounted on a rail. A very interesting note: One of 'Dirty Harry' movies Clint Eastwood actually carried one and shot it as well (Hollywood shotting). CD
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