Norton International 1948? Looking for dating info

Hi folks, I'm new to Norton ownership and also new to the club. So glad to have this resource!

I have recently acquired a Norton here in the states which has no documentation. It's in bits, but was acquired from a gentleman who'd owned it for 50 years previous. It took me 15 years of pestering and annoying him before he finally agreed to sell it.

I have the following numbers:

Frame #13166

Engine #C11 14823 1948

My questions are; what model, size, and year is this? Also, any other information anyone might have regarding this bike, such as what dealer would have sold it.

If anyone has access to original documentation, I would be very grateful for a copy of such. I have a BSA and was lucky enough to be able to acquire copies of the original Origin certification from the BSA owners group, and I'm hoping something similar might be available somewhere for this Norton. The US Motor Vehicles department is frustratingly difficult to deal with on these old bikes, so any documentation we can provide them really greases the those slow-moving wheels.

Thanks in advance for any help you're able to provide.