Named "Porthos" by Weatherman. Dated 1935 in Volume 1 of Great American Glassware of the Roaring 20s & Depression Era by James Measell and Berry Wiggins. Very similar in appearance to water sets by Louie and Fostoria.
The jug is seven inches high and holds 84 ounces; each of the six tumblers is five inches high and holds 9 ounces.