The picture is not real clear but I think that you have a very scarce jar. It looks like Red Book #1646. The description in the book says 'straight line plain tall letters' and yours looks like the drawing. It is Canadian made and comes in either ground lip or smooth. There is no indication if one is more scarce than the other. Book value for a quart is $100.-$125. A very nice find.
George
I think you got a good one there! I THINK this is Redbook #1646. Quart aqua books out at $100-$125 in good condition. It would need only a regular zinc lid to finish it off. How dinged up did it get in the dig?
It came out pretty good, only a few scuffs from back when it was dumped and some discolouration around the top where it was ground down. there are quite a few bubbles in it too.