Google and try antique glass antique canning jars, and if it is a 'fruit jar' or canning jar there will be a brand name on it like Mason or Ball and there should be numbers on it somewhere on the bottom or lower side. If it is just a multipurpose jar, list any legible markings. Good luck. If you can't find anything, send a pic to the antiques roadshow and if it has any value at all they will know.