13/16” wide with their initials “HM” in white enamel all against a blue enamel field accented at the center by fine engraving in the brass of a spigot with valve and handle above. An unusual emblem of support from the plumbing/pipefitting trades. Has maker’s or union mark on reverse consisting of a pair of acorns plus what seems to be a letter “D” within a box. N. Mint, displays Mint. Rare. From the Morry Greener Collection.