The Vermonter Flask by Jacob Bromwell
Jacob Bromwell has been crafting fine metal products since 1819!
You can imagine that they might want to fiddle a bit with design in those years.
Here is their Vermonter Flask. Similar to the legendary "Great American Flask", the Vermonter sports a threaded copper cap. Beautifully hand crafted in copper and ready for you to patina the hell out of it.