Military – TRW Military 500cc Side-Valve Twins YEARġ950 to Current engine and frame numbers match DATE Thanks to Dave Gaylin and Lindsay Brooke for printing the above information in their book “Triumph in America”. By 1950 frame and engine numbers were matching. TR5 models had separate number series engines from 101001 to 106424, frames from TC11001-T to TC13107-T. Note: All Grand Prix T-1 00’s have letter ‘R” suffix following engine and frame numbers. TR5 models did not have separate number series but ran concurrently with all other models. TR was followed by a ‘T” after the actual number. Frame prefixes were ‘TL” for the 3T up to 1948 and TC for 1949. This practice followed religiously and some single prefixes may appear on postwar models. Year shown in engine number prefix with two figures. “TF” for the T-I00 and later 39/40 Speed Twin. Frame prefixes were-“TH” for early Speed Twin. For example 8-T-33445 is a 1938 Speed Twin (later identified as “5T” instead of just “T”). Year and model shown as prefix to engine number.
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