We have a green glass jar with a black metal screw off cover.  It measures about 3 5/8" x about 3" across the top center.  The black cover has a tad bit of rust peaking through.  The covers screws on/off easily.  It is marked 8 oz in the glass on the bottom.  There are side seams in the glass on both sides from manufacture. 

Green Glass Jar Black metal cover Vintage