Need Help to ID - Lever Cap Canning Jar
Found a trio of these Jars at my Local Salvation Army. I had not seen anything like them, so for $4 a piece I scooped them up. I figured a quick google search would provide more info (make, age, purpose, rarity) but I've turned up nothing.
Only mark is a W enclosed in a circle, which I think is Wheaton; but I've not turned up any thing similar. I'm not even sure if they are canning jars or some type of lab/embalming type of jar.
There is a visible mold-seam in the bottom and top glass and the glass does appear to contain tiny bubbles of air. Any information the forum could help provide would be greatly appreciated.