This is a 1:1 (non-reversing) rev clock gearbox that can be fitted to any of our outer timing covers - and most other British motorcycles using this style of rev clock mount. They are excellent quality - and although not of the 1930's/40's bronze type originally fitted to most Cammy Nortons of that era (which are unobtainable now), they are of the slightly later design that were commonly fitted to later Manx Nortons from the early 1950's and other British sports/racing bikes in 50's/60's and definitely look the part.
Unfortunately I have not been able to find anyone yet manufacturing the bronze cast type that would have been originally fitted to Norton's in the 1930's-40's, but this is of a very similar design, and was of the type that were commonly fitted to competition bikes from the early 1950's onwards.
These are good quality rev clock gearbox's and are UK manufactured.
The type here has the correct angle of output and I believe the 1:1 (none reversing) ratio was the ratio originally fitted to pre-war Norton's - but you will need to check your own rev-clock, as it is very rare to find someone who still has their original Manx Norton rev clock still fitted!
In addition, we also stock the 2:1 none reversing type (Item 0339) and we normally keep at least one 1:1 Reversing type gearbox in stock (0338B) - but this needs to be requested, please email us seperately when placing your online order. If you are not sure what the difference is between reversing and non-reversing - please email us on email@example.com, and we will happily confirm the two types so you can ensure we supply the correct gearbox for your rev clock.
Please note - we also stock the 2:1 type (none-reversing) gearbox - Item 0339, and can obtain the 2:1 reversing type by special order