Sheet iron pipes

Pipes hammered up from sheet iron - common trade item showing up in the mid 1600's down in the Tunica Indian sites along the Gulf Coast, on up through the original 13 Colonies in the early 1700's, and all around the Great Lakes fur trade area up to around 1800. And one reference to one in 1700 near present day New Ulm Minnesota at Fort Hullier. Originals also made from sheet brass. Just formed/bent to shape. The seam seals up naturally in use - no solder.