If you keep in mind that the jars are old, and may break easier, go ahead. Only thing that I've noticed is, the top of the jar is sometimes thicker than the groove in the lids and then the seal doesn't work as well. I don't use the OLD Blue or Green jars for that reason, those become jars for 'stuff' not canned.

Most of my jars, prior to the ones that I purchased this year, are from the 70s and before.

Speaking of old jars, has anyone seen a "Presto" qt jar? I found one in my collection.

The issue with old jars is with the threads on the neck. If the lid fits, it's useable. The MAJORITY of jars in my supply are second-hand. They're hand-me-downs, auction finds, and goodwill purchased. Mine get used for pressure canning as well as HWB. I have not had a jar break on me in decades, unless it's one I've dropped. I have never counted how many jars I have, but given I may put up three or four hundred bottles of produce, you can imagine. I buy new ones only when I run out of a particular size. Just check them first, as you did and clean them well.

I use my MIL's old jars from the 40's, 50's and 60's no problem. Do check the jars carefully for problems.

I think a lot of a jar's longevity is connected to how it's been treated over time. Jars old or new break because they've been "concussed" or sustained scratches from metal knives inserted inside to remove air bubbles or product.

I can't tell you how many times jars have been returned to me clanking around in a plastic bag. Actually it's amazing that they almost never break regardless.

Carol

Thanks everyone for the responses. They are really good with no scratches, cracks or chips. Old jars have always made me nervous for using. I'm excited to try them out. Thanks again.