This is how the puzzle comes together...one piece at a time! It may take a while to collect all the pieces…but with the help of others the evidence will eventually prevail! We can narrow down the origins of your hub by a few known facts; the English & US versions of the The Tricoaster were identical, except for two distinct differences. 1) On the English version, the word NOTTINGHAM was stamped under the word (patented) . 2): Early English hubs were typically 40 holes. The below diagram of the Tricoaster produced in 1914 at the Sturmey-Archer Gears LTD plant in England illustrates 40 holes. The 36 holes version was first introduced for SA on the Tricoaster 1914 version (US made). It wasn't until after WW1, did Sturmey Archer offer a hub with an option of 36 or 40 holes. The above diagram found on the SA’s website, contradicts information posted also on the SA site http://www.sturmey-archerheritage.com/images/photos/pic-493.4.jpg this statement suggests there was a TYPE "F". As I've mentioned (see post #3 of this thread), I can not find evidence of a TYPE 'F' Tricoaster. I believe it was a typo and the author was referencing the TYPE ‘FN’ Tricoaster (as seen in the diagram) It's identical to the US version and also produced in 1914.