I had been told that the three P&M engine assemblers stamped an initial with the engine number, probably for warrantee purposes.But did ALL Triumph machine assemblers have three initials? To avoid making the task too difficult I concentrated initially on Models P, and then progressed to other models.From the time when Triumph started producing machines with their own engines for 1905 the engine would be date stamped with the date of machine assembly.Engines, frames, and later, gearboxes were made in different parts of the Works.
Thus, I still need Triumph owners to come to me with their numbers and letters.
I reasoned that no one picked up a punch and hit it with a hammer without a purpose - well, not a rational person, anyway, and again I reasoned that Triumph employees were pretty rational people or they would not have been hired.
Having purchased the remains of two Triumphs with such undeciphered letters I decided to find out for myself what they might mean.
Location of Serial Numbers Before ordering any parts, it is essential that you have full details of the chassis number, engine number, body number, rear axle and gearbox numbers. The commission or chassis number on early TR6 models was mounted on plates affixed to the top of the inner left hand front wing.
The plate included the commission number which could have a suffix “L” OR “U” (1971 on) for left hand drive models, and “O” for overdrive. Later TR6 models had the commission plate attached to the left hand ‘B’ post, below the door shut plate. Two plates attached to the bulkhead were body numbers.