Can anyone help me identify?

The glass has a very light purple tint. There are many air bubbles in the glass on the entire bottle from the bottom to the mouth piece. The seam does go all the way up but 1/2 way down the bottle you can see on both sides where the seam splits. Straight down it looks like a molded seam but a line on both sides goes off to the side and down and it looks like someone intentionally put it there durring production. The glass is very uneven and many small flaws in the production of the glass. On the bottom to the left of the mark says B and to the right it says 7

Any info on this bottle would be greatly appreciated. It was found in South Carolina in the marsh in the "sea islands"