This bamboo mug was made for the Aku Aku in Las Vegas, NV and is pictured in their menu as being used to serve the "Royal Tongan" which sold for 90 cents and was made with Trinidad rhum, orange blossom honey, and passion fruit juice. The mug is actually made of natural bamboo and is unmarked. There is also a shorter version of this mug. Both designs were used at multiple locations and sold commercially in sets during the 60s and 70s. There are matching trays and pitchers as well.