The Greener Mk III Police Gun was a single shot Martini action shotgun, made in a unique guage- a tapered 14 g, with grooves in the head of the shotshell for pins in the action to fit into. These are somewhat scarce, and have frequently been rebarreled to 12 g. Value will depend on condition and originality, but seem to average $400-$500. There is also a Greener GRADE 3, side by side shotgun, and value of these is MUCH higher. As with ANY gun, value is driven by condition and originality.
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