Large and heavy glass lab jar? This makes an interestingly quirky cloche (any time of the year, but especially Halloween, I think!).
Measures 5 3/4" across the base, 4 1/2" across the opening. It's about 13" to the top of the dome, 14 1/2" tall overall.
Has a few bubbles, spots and marks to the glass, no chips or roughness. No makers marks on this that I could see.