Here are a couple pics of a bottle that the forman found on the construction site we're hunting. It reads "THIS BOTTLE CONTAINS GOOD LUCK BLUING". Anybody know anything about this bottle. He has really been friendly to us and lets us know of new sites that they are headed to. A buddy says it's not pre-1900 because of the diamond mark on the bottom...but the wall thickness of the glass is thicker on one side than the other towards the bottom. I know nothing about bottles so any info would be appreciated.