Hoping someone can help me ID and date this canning jar. It is a square, 1-cup jar. It looks to be threaded for a zinc lid. It is embossed on 2 adjacent sides with a script "Mason' logo, and on the other two with 1/3- and 2/3-cup markers. The bottom is embossed with a 49 and what appears to be a "JL" logo. #canningjars #masonjars #mason #antiques #glass #jars