Appears to be a Westwood mug from the 'yellow face' series although it is unmarked with no sticker.
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Tiki Mug Design
Westwood Style Yellow Face Diamond Tiki Log Mug - by Nasco
in 2 collections
This mug is made to look like a log, with a sort of a branch-like handle on the side. There is a tiki face "carved" in the side, and painted yellow. This version has diamond-shaped eyes and a triangular mouth.