Looks to me like it's not a true hammer gun. I have one made by Henry Adkin (Bedford) c.1880-ish, a rotary underlever with a straight stock and Damascus barrels. They are considered evolutionary, another step towards the modern hammerless profile. I think it is one of the most fascinating phases of the development of the modern gun. The articulation of the would-be (exposed) hammer serves to cock the interior (true) hammer. Mine goes to half cock first and then to full cock. Gil

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