Many years ago I made a similarly durable coffee mug out of a section of 306SS pipe, and a disc cut from the same type of SS stock sheet, (actually, a hole punch-out). All of it was nominally .0625 thick stock, so it is still quite durable. The handle is a chunk of SS tubing pressed sort of flat, then bent into the handle shape a d silver-soldered on. Prior to creating this mug, several mugs had net their demise while camping with friends. This one survived.
Here's the creators and the story behind the mug. See links below.
They don't tell what mfg. company makes them. They just say:
"Battle Mug starts life as a 13.5 pound solid block of 6061 T6 billet aluminum before it enters a state of the art CNC facility in Huntsville, Alabama. This facility produces specialized parts and equipment for the U.S. Department of Defense, major weapons manufacturers, NASA, and a host of other companies working at the U.S. Rocket and Space Center."