HELP I.D. THIS BARREL MUG

Found this at a thrift store in New Westminster, BC. Anyone ever seen a barrel mug like this? No markings or stickers anywhere on it. 5.5" tall, 4.5" wide.

I have seen similar at Goodwill. But also without any markings. Wish I could help.

Looks similar to a 'undertow' mug I have from Tiki Farms, stamped on the bottom...