Cute and functional. It looks pretty clean to me!

Here is a jarhead discussion that sort of addresses the evolution of that mark: https://www.collectorsweekly.com/stories/128358-jar-ive-never-seen-before

You didn't ask, but if you put a small piece of copper wire in the water, your flowers will last much longer.

I have been wondering about a few I got at a garage sale. I'm not a collector, but have always liked them. I just learned the tops are probably zinc, I had thought they were lead, but zinc makes more sense now.

I have 2 of the larger one and a small. The large ones came with a glass topper of sorts, or seal, that bseems can be held in place by the ring screw down things. I suppose to be used in conjugation with a rubber seal when canning (don't worry I don't can)

Does anyone know about the glass top things? I've glanced at some sites but have not seen these glass seals/tops.

They don't really stay in place, but just sit on top and wouldn't easily stay on with out the screw down rings.

Sorry, didn't mean to hijack.

The glass tops...the clear ones are meant to be used with a sort of clamp on the lid....there is also a milk glass liner that goes with the zinc screw on lids that are used with a rubber jar ring.

Glass jars using a glass lid that was clamped in place: That type of jar will have a pair of deep indentations on its side and under the top rim where the bail hooked in place. The seal was a flat, large diameter rubber washer. If the toggle-bail is gone, those indents will identify this type of canning jar. If those indents are missing, then this jar was intended for some other use besides canning, maybe a jar having a lid with a knob.

Canning jars with screw-on metal lids were sealed with a flat rubber gasket. The inside top of the lid was usually lined with glazing to keep the contents from contacting the lid metal. The sealing gasket may have had a tab that protruded beyond the lid. Its purpose was to help unseal the can at opening. One pulled on the tab to pull the seal ring from under the lid. This relieved the vacuum and made it easy to unscrew the lid.

Both of these types were superseded by a jar having coarse threads at the top and used a thin metal scew-on ring with that held a relatively flat lid. This lid was slightly domed and had a thin elastomer seal bonded to it. This lid had a superior feature in that it indicated if the jar was properly sealed. During canning, after tightening the ring, the dome would snap down with a 'pop' sound as the contents cooled and drew a vacuum. The canner could test a jar for seal quality by pressing the center of the lid. If a good vacuum existed, the lid would already be snapped down and taut; If sealing had failed, the lid would be domed upward and could be pressed down. That can would not be stored and its contents used shortly. If desired, the caned goods could be stored without rings, and the rings removed for use on the next batch. However, those rings were inexpensive and most canners left the rings in place as added assurance that a lid was not lifted. After storage, the canner could check his/her stored stock for seal integrity. To open this jar, remove the ring and pry the lid off; Discard the lid, the ring is reusable.