Triumph TR4A Commission Numbers, Change Points, and Overall Production Numbers
(from Piggot's Original Triumph TR):
CTC 50001 - first TR4A, built January 1, 1965.
CTC 50125 - Gearbox and clutch housing modified slightly.
CTC 59836 - Packing pieces changed on front springs (presumably this is the change from short springs with aluminum spacers to slightly longer springs with no spacers).
CTC 62191 - Stromberg carburettors deleted and twin SU HS6 substituted, still on same intake manifold, TW needles.
CTC 62637 - Temperature sender and gauge modified.
CTC 78684 - last TR4A, built July 10, 1967.
Suffix letters in Commission numbers
L (as 1st suffix letter) -- left hand steer
O -- overdrive
Total production numbers:
1965 13735 (CTC 50001)
1966 11097 (CTC 64148)
1967 3633 (CTC 75172)
There are clearly some omissions here - I know that CTC 7xxxxx has Stromberg carburetters, for example. Piggot's numbers and change points are completely oriented towards the home (UK) market, and he neglects a number of details that pertain to export cars.
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