I agree.It was a good idea, and one that really should be more common today.
I would think it's a jelly. Am I close? Also thought I'd show a Queen canning jar I found nearby.
It also had the red gasket. I took it out because it was so fragile. Thanks for the feedback!I don't care how old it is, or isn't, that Queen Trademark jar is a nice one. That said, the fact that it appears to be turning amesyth is a clue that it might be older, perhaps prior to world war one. So, I'd be interested in knowing its age too.