I came across a piece of sea glass today which had legible writing and a rectangular shape. Knowing nothing about antique bottles, I would like to know more about this piece. Top line reads D-126, middle line 18<>55, and bottom line MADE IN USA. I believe it to be a Seagrams pint, bottled by Diamond in PA based on what I could discover but I would like to learn more about the meaning of the 1855. Thanks!