Duncan,
Re: the Chater Lea cranks you have on auction I believe that the 'Eisenmann' stamp was the New York importer/shop of the same name... not a MFG of the ring for CL. I have seen that stamping on lots of BSA rings too.
Good luck on your auctions. I have 31 ending tonight-Garage Sale #2 http://tinyurl.com/
Matt Gorski Belmont Shore California USA
>Chater Lea crankset (6.5 inch) with 48t ring: http://ebay.com/
>or item number 150086277448
>
>Thanks for looking!
>
>Duncan Granger
>Mountville, PA