I'm betting what you've got there is a British-made Single Ring, and so its serial number wouldn't match up with the US series that's on the wiki. If it were an American-made razor I would expect a serial number that low to be on the barrel and not the guard plate. You should be able to tell one way or the other by the patent inscription on the handle.
Sorry my mistake its a Canadian razor and I've mis-dated it on the US date chart.
Is there a date checker for Canadian serial numbers?
http://www.mr-razor.com/Rasierer/Old...1%20Canada.JPG
the set is def this set, but for date codes i dont think there is a good guide to match canadian serial numbers up to the dates, or at least none i have found, most of the info we have comes from three books and i think all authors were american and did their research and dating in the USA
but the set on the site has an inspectors signature and date saying oct 13 1910 on it which is how that particular set was dated
it may be the best info your going to be able to get
the earliest Ad I know from this set is the 1909 catalog: