Please identify this motorbike

[RandomHero91]

This is a photograph of my grandad i would guess around 1946. Please help identify the bike

[33d6]

That’s a tricky one isn’t it. A combination of Box Brownie lens and fashionable baggy trousers of the day neatly eliminate any recognition points.
I’d say mid-late 30’s with the twin filler caps hinting at a combined petrol and oil tank for a total loss lubrication system. That would cut it down a bit. Levis, Ok Supreme, Montgomery. Anything fitted with a JAP engine.
I hope someone knows. I can’t pick it.

[cardan]

My first thought with the twin filler caps was BSA C11, 1939-ish, but I can make out enough different bits and pieces to rule that out. Rear brake inside the back sprocket on the left, decent size front brake on the right, and I fancy I can see a full cradle frame under the engine joining the front down tube. Mmm... tricky. Much easier to identify a British bike from the timing side!

Leon

[R]

So, we have twin petrol caps, a lucas headlamp with ammeter and switch on toppish, and a biggish looking sloper engine
(unless its a v-twin, which I'd doubt - doesn't look solid enough build).
Rear brake inside the rear sprocket.
And whats that circular object in front of the engine, below the horn ?
So its 1930s, and almost certainly British.

At first I'd plump for a Raleigh, but I think the headlamp is later.
Hmmm