Vintage 1960’s or 1970’s Tervis style tumblers (2) for cold beverages

Truly Unique vintage early Tervis style tumbler set (2) Plastic sailors sit between the layers These were my grandparents cups As a young child I LOVED these and it was such a treat to get to use one! Made in HONG KONG with UK PATENT PENDING#202 4” tall x 3.5” wide If anyone has any information or has seen similar ones, please comment. Especially on the year of these. I am going by style and memory only