Those are commercial product jars (mayonnaise, pickles, etc.) from the ’40s through the ’60s. The Owens Illinois Glass Company of Toledo, OH registered the trademark “Duraglas” on September 23, 1941 claiming its use since November 1940. They are not considered to be particularly rare and usually are not listed in fruit jar books. Subject: (5.10) Four-gallon Mason jar with an Eagle embossed on the reverse. This is a display jar that was never intended for canning but was used in stores to display items such a pickles or beef jerky. Owens-Illinois Glass Co. Libbey Glass Div., Toledo, OH, made them in 1975. However, as a go-with, these jars are somewhat popular with some fruit jar collectors. It was produced in four colors: clear, aqua, smoky amber and cornflower blue. These jars are worth about $50 each. A smaller version of this jar (worth much less) was still made in the 1990s and might be found in restaurant supply stores such as Smart and Final. Subject: (5.11) Ball Jar that has the