An aqua quart embossed: "MYERS TEST JAR". A line of embossing that was peened-out of the mold on front originally read: "PATD 1869". Comes with the original glass lid and original pivoting-action brass clamp in untouched condition with an old darkened patina. Shiny glass without damage or stains other than a rough ground mouth that was made that way. Base: unmarked.