Is that measurement on the same frame? The sidecar mounting lug hole looks smaller than the other picture? If it is, it's a civvie frame as the WD frame is about 7" and the civvie is about 9"
I was measuring my mates 35 frame at the Norton owners meeting last month. Otherwise it was the same as an early WD frame with up right seat mounts.

email (option): horror@blueyonder.co.uk

The frame number looks to me like an original stamping and everything fits for a 1935 civilian frame...although after a bit of research, I can say that it seems to have been an interesting one.

Frame 56911 was part of a batch of 30 model 19s finished in grey with 3 gallon tank, folding Kickstart and Crankcase shields. Despatched 25th April 1935 to the United Africa Company, Dakar.

It was clearly destined for 'Colonial' use but whether that was by a government agency in West Africa or a commercial organisation will probably remain a mystery.

https://en.wikipedia.org/wiki/United_Africa_Company

That sounds like a fantastic bike, a grey Model 19 with extras. I would have to try and build it back to that now
Correct me if I'm wrong Rik, but wasn't the "Colonial" Norton's given the higher ground-clearance frame? I'm sure I read that somewhere, but that maybe for earlier bikes.

Ah, just answering my own question, a 600cc Model 19 engine wouldn't fit in the higher ground-clearance frame, but a 500cc engine will

email (option): horror@blueyonder.co.uk

The 'Colonial' spec related to the Model 16'C' in the 1920s. It seems to have disappeared with the last of the flat-tankers. There was no 16C in the post-1932 Edgar Franks range.

Yep, a grey Norton with a crankcase shield, a solar topee and breeches...I like the sound of that pose !

Thanks Rik, I thought it might be for earlier bikes
A 1935 Model 19 would have the open valve engine with parallel pushrods, lovely if you can find one

email (option): horror@blueyonder.co.uk

All

Many thanks for your respond and comments. It comes to conclude that the frame is not WD frame.
I am very far away from all you experience about Norton bike. Nice group here..

Regards
Rofiq

email (option): rofiqmgl@yahoo.com