Clive,
I would love to see that information. With luck it will include some earlier machines.
Wartime production Norton 16H s should have a "W" prefix on their (originally matching) engine and frame / chassis numbers (the Big 4s have an "S") I too would assume that this is the "serial" number.
I have seen some corresponding numbers on documents realting to machines that made it through to BAOR records but no 1939 / 40 bikes.
Rich
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