Those jars need rubber rings for the seal. In Europe they are still available, either new as a complete item or spare rings by the dozen. However, some sizes of the older ones might be hard to find.

When I use bottles like these there is usually a rubber ring that goes between the jar and the lid.

I worder if the glass top was used after the jar had been opened? Some of these old jars sealed with a rubber ring and a one piece screw on cover but that wouldn't work with this glass cover.Anyone else have a better answer?

You must have two things, a rubber ring between the jar and the lid and a clip which holds this together during you are cooking the jam or what ever in a pot with water in it. Years ago my mother did this.
This is not for filling the hot jam and close it after, the food will be cooked in the jar!

Here is a glass canister that I have. You can see the rubber gasket that effects the seal. Yours should work similarly, except the metal ring seems to screw down over the glass lid. If you can't find rubber gaskets to fit, they sell sheets of rubber gasket material in some auto parts stores and you could cut your own.

Back in the days when y ou sterilized everything that went in a new born's mouth I had a lot of those. I would sterilize the jar and keep sterile nipples and covers in them and use sterile tongs to reach in and get one out for ea. sterile bottle of sterile formula. A lot of work back then. Always had the rubber gaskets that you had to boil to sterilize also. This really brought back memories. Young people today have no idea what it was like. LOL. They are so fortunate. For inquiring minds/ I was unable to breastfeed. Lillian/AKAlbrow

hi there you mis rubber rings and i do see some metal rings on photo i do have some but they do not seal so well any more but still use them for storing dry stuff like lentils memmories never dies enjoy them

Loralye - if you go to Canadian Tire you can get the rubber rings. They come in a box of about 12. You sterilize the jar, the glass lid, the metal ring and the rubber ring. When you make jam or anything in these you put the jam in - quickly wipe the top with a danp cloith and put on the rubber ring on the glass top and put that on the jar and then put the metal ring on. Do not dry anything - the dampness somehow helps to seal it. You tighten it and then back it off a 1/4 turn and when it has cooled completely, then tighten.
I still use these and some of them I use the metal tops that have the rubber ring stuck to the lid.
As you are in Canada - you might have a Peavey Mart close and they also carry the rubber rings.
Good luck.

You can always use a parafin wax seal if you can not find the rubber rinds. I think you will do fine.

When i use mine or my peaches i was always told to overflow the jars a little and this made them seal .An it works!!!
Some of mine allowed you to use the new rubber rings instead .Check it out and see if one fits.If the jars din't seal i reheated them in the microwave .Saved time and it works .Have fun hugs

I had some of these from my granny and was able to get new rubber rings for them. That was eons ago when I was still living in California. I only used them once and then just kept them as a memory of my granny. I guess I just didn't want anything to happen to them...Hugs...Carol