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In celebration of this, they called their new bicycle the “Enfield”.
A new company was created to market these new design bicycles called “The Enfield Manufacturing Co. The next year, the word “Royal” (after the Royal Small Arms Factory) was added to the company name and thus the Royal Enfield began.
This applies throughout production, from the first 500 Twin to the last Series 2 Interceptor.
The photos I have of early engines show the alpha prefix on the right hand half and the number on the left, in similar manner to the "true" engine number.
These numbers have a W or W5 prefix for 500cc and (usually) a W7 or SM prefix for 700cc.The published lists referred to in my other posting indicate that there are some T7 and TR prefixed numbers in 1954, but I have yet to see an example of this.All of these engines with a "true" number on the front were paired to frames at Redditch by having the frame number stamped at the top of the left hand crankcase just below the cylinder joint.In 1901 came the Motor Bicycle with a 150 cc 1.5 hp (1 k W) engine above the front wheel.In 1902 a similar contraption appeared with an Enfield engine of 239 cc 2.75 hp (2 k W).