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When I had a Cosworth built twin-cam, Cosworth gave me the build details (e.g. type, spec. and first owner).
That had a 5 digit number that split as follows
type = 2 digits (e.g. 13 for the twin-cam)
number = 1 digit (e.g. 6 for the twin-cam, 6th one made - presumably this will go up to 2 digits as necessary)
year = 2 digits (e.g. 63 for the twin-cam)
The nearest number you have to that is 19645 which would suggest type 19, 6th one made but built in 1945 is unlikely. 5th one made in 1964 is a possibility?
I'm sure Cosworth should be able to help you, they still have the records.
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