I have an older Norton motor I can't seem to identify.
It has a positive BIRCO stamp and a positive serial #24237
at the base of the jug.
It also has an ID stamp N15CS/110754 on the bottom end.
I was told it is either a 650 or 750 commando.
Any Help would be appreciated!!!
Birco was the company that made the cylinder casting so little information there.
However, all the information that you need is in the crankcase number. The N15CS was a "Hybrid" built using the Atlas 750 motor in a Matchless G12 type chassis (The Matchless version was the G-15CS)
Approx 5000 were made between 1963 - 1967. Your number sounds to be from 1964 - 110774 was the last one made that year.
I have taken this information from the 1994 Norton Owners Club calendar, an article written by Paul Morin which goes into great detail on all the AMC hybrid models.
I hope this helps,