Jard Products was based out of New York City and was a business front for mafioso Johnny Dio.
With this in mind, there was little transparency about business matters and little else is known about Jard Products, Inc., also known as JPI (established @1964).
Their mugs appear to have only been used at the Hawaii Kai restaurant in New York City. The Jard designs are identical to those made by Otagiri Manufacturing Company, whose items were used by Hawaii Kai previously, and the elaborate foil diamond stickers used by both companies are nearly identical. Items from both companies were manufactured in Japan.