Triumph TR7 VIN Decoder

At Speke, Liverpool, the prefix's first letter is A, for the factory, and its second is C, for the TR7 and TR8; the third gives the market or the model. The number follows, and a suffix may follow that.

The suffixes on these numbers, and on Canley's, add detail:

The home-market ACG numbers began in June 1975, almost a year before British buyers could have a TR7. The first series, numbered from June 1975 to October 1976, was small: about 50 cars, the club's guide says, and the TR Drivers Club records an early competition car among them, built on 3 July 1975. The club's guide also gives a total of possible cars for each prefix, but its figures do not all follow from its own ranges, by our arithmetic.⁠source 1​source 5

At Canley, in Coventry, the first letter became T and the numbers ran from 100001.

The Canley models seem to have shared one series of numbers, or the series had large gaps, the club notes, so the ranges say little about how many cars were built.⁠source 1

From October 1979 a TR7's VIN has 14 characters: an eight-character code and a six-figure serial. Michael Hart's count of the build cards gives the code of the Californian cars that Solihull built with fuel injection, and the first of them was number 401225, on 1 July 1980:

The other codes, from the club's guide:

British cars carry A for the model year whatever their date: the guide marks only B and C as not used on them. From May 1981 Solihull put SAT in front of the code, for Europe, the United Kingdom and Triumph, and some North American cars of 1981, TR8s and possibly TR7s, the guide says, had 17 characters, with a check digit in the ninth place, worked out by a weighted sum divided by 11, a remainder of 10 written as X.

The TR7 Spider's numbers ran from 400301 to 401918, by Hart's count. The guide prints the first Solihull series as 400001 to 410918, but its own figure for the most cars Solihull's numbers allow, and Hart's count of the build cards, show that the series ended at 401918.

The last TR7 is recorded by the TR Drivers Club as TPAD37AA408534. Its serial is not in doubt, but the code does not fit the guide's lists: the guide gives no specification letter for British cars, and a "3" stands where the engine letter belongs. Hart's codes have J there, as the guide's list does for the four-cylinder engine, so the "3" is probably a misprint, by our reading. Nor does the code begin with SAT, though the guide says Solihull added it from May 1981; only the factory's record would settle either point.⁠source 1​source 6

Two numbers prove a Sprint: its commission number starts ACH, and its engine number has CH in front and HE at the end. Any other TR7 with a 16-valve head has been converted. No source read gives the prefixes of the ordinary eight-valve engine's numbers.

The V8 cars carry prefixes of their own: ACN for the pre-production coupés built at Speke in 1977, and TCN and TCV for the Canley TR8s. The works rally cars, built at Abingdon and run as TR7 V8s, are known by their registrations, which the notable cars list; the buyers guide explains why a road-going TR7 V8 is almost always a conversion.

For any TR7, the British Motor Museum at Gaydon issues Heritage Certificates from the factory's build records, which run from 1946 to 1981 and give a car's original specification.⁠source 7​source 1​source 8​source 9