Here are my most recent beach combing finds, three Westwood Tiki mugs from Japan.
Westwood produced Tiki themed ceramics between 1960 - 1975. They were often thin-walled with a bright graphic design, and manufactured for general retail sale.
Ooga-Mooga seems to suggest that there was a wide range of Westwood products available from mugs to condiment sets and full dinner services.
The examples I have added to my mug collection here are:
Top: Mug W2
Middle: Mug W4
Bottom: Mug W1.