1963 Slimline engine and frame numbering

10500 series is for 1963 model year. The engine should be stamped 88 for, oddly enough, an 88. Not sure aboutthe P though - P was the 1959 model year but the lettering was discontinued after R and 1960.

My 99 engine is stamped99C 85787 butthe frame is stamped 14R 85785 - so only the frame number is on both. That makes it a 1960 model year bike though it was registered in December 1959. Hope that helps.

Isn't the 'P' for Plumstead?

Previously sundarraju_sivaraja wrote:

Hi,

I plan to purchase 1963 Norton Slimline and cofused with the engine number which read as 88/105440/P. This is something new to me as owner of Norton Model 7 & Wideline which has different format of numberings.

Also I don't see 122 in this Slimline engine. So can anyone please confirm if the engine is correct? Does the word P exsist starting 1963 onward? Thanks

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88/105440/P............This engine was built at the end of 1963. By then, all Norton production was at Plumstead. This is confirmed by the suffix letter 'P' after the number.

The frame should be stamped with122 105440. Early engines from Bracebridge had 122 stamped on the front left of the cases but some later Plumstead built engines had 88 or 88SS.

My 88ss was 1963 and number begins 88ss not122. Also has a Plumstead 'P'. So your number looks OK.

The frame has 88- and number but it has no SS or P.The engine has 88SS and has /P at the end.I have an old style log book and the numbers are the same.Yours is about 600 before mine.Have fun!

The frame has 88- and number but it has no SS or P.The engine has 88SS and has /P at the end.I have an old style log book and the numbers are the same.Yours is about 600 before mine.Have fun!