Hi
Thanks for posting. Your jar is mid 20th century - as in 1940s, 50s, 60s, maybe 30s as well. The shape is all we have to go on as to use - if you were to search, for example, for "vintage Heinz food jars label" you will find many similar examples. Here is a photo of one that I got from an eBay auction:

I am not saying your jar was necessarily used for a Heinz product nor was it necessarily for a pickle product.