Frame Numbers - British & American.

Chaps, does anyone know if there is a correlation between UK and US frame numbers? I have found quite a bit of information on the net regarding CT70 frame numbers but little about UK ones. The US frames are prefixed with CT70 but ours are obviously ST70, is there any close relationship with dates and years hidden in the following numerals? If a US frame was CT70 137... from what I have read and seen it would come from 1970, would this be true of a ST70 137 frame too? Or do the frame numbers not relate to each other as the US swallowed frames at a faster rate than the UK, if you follow what I mean?

The only thing that they seem to share is the 6-digit frame numbers for very early ones.

CT70 * 100 001 * 1969 - 1971 * Type CT 70 K0
CT70H * 100 001* 1970 - 1971 * Type CT 70 HK0
CT70H * 200 0001 * 1972 - 1973 * Type CT 70 HK1
CT70 * 200 0001 * 1972 - 1973 * Type CT 70 K1
CT70 * 210 0001 * 1973 * Type CT 70 K2
CT70 * 230 0001 * 1974 * Type CT 70 K3
CT70 * 240 0001 * 1975 * Type CT 70 K4
CT70 * 250 0001 * 1976 * Type CT 70`76
CT70 * 260 0001 * 1977 * Type CT 70`77
CT70 * 270 0001 * 1978 * Type CT 70`78
CT70 * 500 0001 * 1979 * Type CT 70`79
CT70 * 510 0001 * 1980 * Type CT 70`80
CT70 * JH2DD010BSxx * 1981 * Type CT 70`81
CT70 * JH2DD010CSxx * 1982 * Type CT 70`82

So would that mean that if my frame number starts ST70 147... That it was made somewhere between 69 and 71 ?

If it's a 6-digit number it was probably built before 1972.

Thanks Waynus. I need all the supporting evidence I can gather if I want to stand a good chance of getting an age related registration number, otherwise it'll be a Q plate

ST70Z ST70-100001 - 137313 '69
ST70 140... 05.06.1973
ST70 145... 04.12.1973
ST70 148... 02.06.1976

HI can anyone help just bought a st70 ,the frame is st70 139 861 can anyone put a precise year to the bike. Will be looking for parts possible new forks. Ta

Probably buit in 1970. Can't comfirm with 100% certainty...