You can look here to get some info and if you provide yours you'll help others as well: https://www.gregmarsh.com/MC/Norton/CommandoSurvey.aspxOut of curiosity, I sent a note yesterday inquiring about my serial #317709 since I bought this new and I thought it may be interesting to see what I'd get back.
This was the reply "We don’t, if you see our webshop, we carry records from 317848 onwards."
Think those blanks were motorcycles going to the US. Everything on this sheet went to England….maybe another sheet for the US numbers.Lot of blank numbers. Anyone could stamp their bike with one of those, and claim it was whatever they wanted it to be!