...make no mistake about it, this Vintage Wear-Ever Brand aluminum Double-Boiler has seen some use! 3 pices, lid-inclusive, it stands ~ 9" tall to the knob... this black neopryne piece states "Wear-Ever" in raised lettering... The bottom portion sits ~ 4 3/4"; an impressed  line with "Water Line" is on the side... Though worn, the Wear-Ever symbol and "No. 1332" is legible on the bottom... The top portion, in turn,  is impressed with "6 Cups" and "3 Cups" markers... The handles are ferous, and show a light film of oxidation... Aside from normal use, there are no outright dings, dents, etc. ... Neither piece is Out-of-round... I am estimating the set to be from the late 1940's ..... Here's My Offer! reference Wear-Ever Double Boiler Bx008