I have a few. Cobalt blue glass, 1920, 30, 40s. The double triangle is so far as known as Vicks registered trademark, only known manufacturer of jar was Maryland Glass Company, of Baltimore.
I thinks it's a cool find and also a vicks jar. I use small colored glass jars (I find) to hold smaller finds. They clean up easily and look good on the shelf. I use one for an acetone bath for some of my finds.
I use them to display all my glass fishig floats. They make a great base and keep my bouys from rolling off the shelf and breaking. I also store my beach glass in them. I love blue glass
since they are not worth much I had to find a way to justify keeping some and they work great for me