My son was working a 1930-40's homesite this morning and found a small bottle that looks old. It is approx. 4" tall and the body is 1 1/4" square. the neck is round and it had a small lip at the top with no threads. I read somewhere that you could age a bottle sometimes by the seam (mold mark). This one goes from the bottom all the way to the top. There are a few small bubbles in the clear glass. Any info would be appreciated.