Mustard was almost a culinary requirement during the 19th century (and before as its use dates back to ancient times) to spice up otherwise bland dishes and to cover up the off flavors of foods in the age before refrigeration and other effective food preservation techniques. The French glass barrel mustard bottle is a relatively early example of "food bottles" or glass jars, embossed horizontally on one side between two sets of rings with MOUTARDE DIAPHANE / LOUIT FRERES & CO (circa early to mid-1900s). "Diaphanous" (implying a very fine product) mustard and similar other imported versions were apparently the "Grey Poupon" of the of the mid-19th century. These bottles were usually made of colorless or aqua glass; very rarely in other colors. The bottle body has no evidence of air venting and was blown in a post-bottom mold although the side mold seam just barely curls around the heel to join with an apparent post-bottom mold seam. Little air bubbles can be seen when held up to the light. No chips or cracks. We love these little French bottles for use as a vase. Bottle measures 5 inchs tall. We have two available in our webshop, but they won't last long!