REPRODUCTION 3 QUART MASON'S BUTTER JAR
Here is how to tell the differents in the orignal and a reproduction 3 quart Mason's Butter Jar. Note there is no "o" between the ends of the C. (abbreviation of Co). Also note there is no base embossing. Authentic ones will have a letter and 2 or 3 numbers on the base. Note the very smooth machined lip, unlike an authentic ground lipped jar. And also note the black band.
These repros are made real well and would fool almost anyone if you didn't know what to look for.
Below are two different reproduction 3 quart Mason's Butters Jars. Note one has thick glass and the other has thin glass. Also the differents in the metal bands.
Frank & Frank Jr. (Wicker) Bottle Collection.