Do the tax strips on the top have any dates? Are the bottles 4/5 quarts or 750ml? Is there a government warning or UPC code? I'd look on the bottom of the bottle too.
Echo Springs - No dates on tax stamps, the bottle is 4/5 quarts, there is no government warning or UPC code, and there are quite a few numbers on the bottom along with a warning not to reuse it. The Park and Tilford is One Quart, no government warning or UPC, and there are a few numbers on the bottom.