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Looks like an norton big 4.
Yes, Norton Big 4! Any chance of a high resolution scan of that picture??
email (option): welbike@welbi🤯🤯.net
If you look closely at the back axle it would appear that this is a driven axle bike that has had the side car fitted continental side?
I think I can also just make out the engagement lever on near side.
Could possibly be a Steib sidecar - headlamp and tail lamp on the bike are clearly continental. Possibly an early machine as the front mudguard retains the number plate fixings.