Hello Officer Beehner, Perhaps you can provide some more information on this archeological site. What you have is a mid 20th Century vinegar bottle. I do not believe that you can closely date it. It has no value, other than as a recyclable. Where in our country can someone be busted for picking up trash? The idea of this is quite disturbing to me. The minimum age for something to be a "genuine" antique is 100 years. "L in an oval (or a circle, somewhat horizontally flattened, seen on bottles)……….W.J.Latchford Glass Company, Los Angeles, California (1925-1938); this became the Latchford-Marble Glass Company (1938-1956); and then, Latchford Glass Company (1957-c.1989). Mark was first used approximately 1925, although during the “Latchford-Marble” era, the mark “LM in an oval” was used instead." http://www.glassbottlemarks.com/bottlemarks-3/cbeehner said:A little more history on this bottle... I am a Peace Officer working on a Arch site theft case and this bottle was recovered by myself and an additional officer. I would really appreciate if anyone can confirm the exact year of the bottle. Per our laws it mustbe 50 years or older to be an Archaeological item, in order to successfully charge the subject...