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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,
Rich.
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