Single walled, could have been a center drain? but welded? shut now. (you can see the center "plug" in the second picture) I'm 15-20 minutes south of Saratoga.
Computer/I-phone glitchy, I can text pics if you want to e-mail me your # and not share with the world here. Texting pics seems to work fine until I get my phone looked at by a "genius"...
Cleaning out and had plans for an old heavy copper washpot? I picked up.
I believe it started life on a big stand for washing. Seems to be copper with nickel plating inside. 2" strained drain on bottom with threaded 1" outlet pipe on bottom. BIG Cylinder shaped, 25" Diameter, 19" tall = 40+...