A wooden gun tompion from the 1845 Northwest Passage Expedition led by Sir John Franklin. It is carved with the broad arrow (British Government property) and 'B O 12' (Board of Ordnance 12 lb).

The tompion was recovered by the US expedition under Lieutenant Frederick Schwatka between 1878-1880. It is described as 'Item 18. Tompion for a gun [muzzleblock crossed through]' in the 1881 catalogue of items that he sent back to Britain in 1881 [TNA, ADM 1/6600]. According to the Royal Naval Exhibition catalogue for 1891 this object was from the Inuit at Starvation Cove. However, none of the accounts specifically mention the tompion. It may come from the vessel that sank near the shore at Grant Point. Schwatka was told by the Inuit of the Adelaide Peninsula that they had found a ship near the shore in this area. It was abandoned except for the body of a European. The Inuit removed anything useful and the vessel subsequently sank. They also reported finding the footprints of the four last crew members on the shore.

The gun tompion was displayed at the Royal Naval Museum, Greenwich, in 'Case 3, No. 4. Gun tompion.' It was also on Display 14 in the Royal Naval Exhibition at Chelsea in 1891.