Well, no supporting evidence was offered, of course other than it being a 3 piece mold with well documented dates for the patenting of that process in England, and of course the pontil type as referenced being a dating factor. True that molded bottles should be relatively uniform in outline etc., but the lip style and finish are also relatively uniform compared with earlier examples. In addition to these three supporting factors, it also appears from the pictures that this may be a smaller "pint' size bottle, as opposed to the larger "quart" sized bottles, with the pints generally being in vogue later than the quarts. We have to be careful in what weconsider gospel regarding the dating, etc. of these bottles. It is very easy for me to ask where is the supporting evidence for Dumbrell saying that before 1831 nearly all glasshouses in England were producing 3 part mold bottles, and of course that comment is based upon an unsupported opinion that this is 100% an English manufactured bottle? I have dug many bottles and shards similar to this bottle in America, in contexts from the late 1830's up into the 1840's. An interesting phenomenon that I have noticed over the years, is that whenever we have questions about the age of an old bottle, and when we do later find real evidence of it's age, it is usually newer than we thought, rather than older. I chalk this up to our human desires to have found items be older rather than newer. The age of this bottle makes no difference to me personally, just offering the original poster an opinion that he was looking for, that's all.