Hello KL - the first thing that came to mind was the proverbial Kilner Jar. Not seen so frequently now I guess since modern mums or wives no longer bottle or pickle their garden produce. I can remember seing only those examples with the traditional open ended screw top over a rubber seal, but dountless, since there have been many copies, then other forms of sealing may well have been used.
I'm probably breaking all the rules here by quoting Wiki, but a very quick search came up with the following:
"Kilner jars are often confused with a similar jar featuring a metal hinge and a rubber seal. In the United Kingdom, these are sometimes known as "French Kilner" jars. In the United States, a jar sealed with a metal hinge leveraging down a glass lid and rubber seal is said to be using a "bail closure."[unreliable source?]"
Do you think that there might be any connection with your 'jar'.
