A piece of copper sheet from the 1845 British Northwest Passage Expedition led by Sir John Franklin. The copper item appears to be half of the top of a rectangular tin with the edges originally folded over and riveted onto the sides. these edges have now been flattened out. The top had a circular hole in the centre with a soldered collar.

The piece was found with other scraps of metal on the east side of Montreal Island by Carl Petersen, Interpreter, from Captain F. L. McClintock's sledge team on 15 May 1859, as part of the search expedition led by McClintock. McClintock records that the only traces or relics of Europeans found at the east side beside an Inuit inukshuk (cairn) included '...part of the rim of some strong copper case or vessel', having been moved there by Inuit. [McClintock, Voyage of the Fox (1859), page 371].

The copper was displayed at the Royal Naval Museum, Greenwich, Case 2, No. 39. 'Pieces of iron and copper sheet'. The item is shown in - 'Stereoscopic slides of the relics of Sir John Franklin's Expedition' photographed by Lieutenant Cheyne RN, at the United Services Museum, Whitehall, No. 3 (upper middle right).