Royal Enfield Firefly Deluxe.

Bottom bracket had M D and 1 stamped on it.
 

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Hi, that's an unusual frame, I don't see it as a Claud, serial number is in wrong place, and if so, I would say it was closer to 1943 than 33. Lugless lightweights ( my 1921 Rudge is lugless but a bit heavier ! ) really got started here in the UK in the late thirties, with better tubing and new brazing techniques it made common sense, but it toke a bit of time to be fully excepted in club circles ( a reason for bilaminates in the forties - decorative and strengthening for lugless lightweights ). Don't under estimate Royal Enfield, the Mayfly and Bullet were two reasonable larger manufacturer machines at this time, with 531 and AP, keep digging the fork is worth a focus, I will keep an eye open. Terry
 
Re:

The frame appears to have cast lugs. The quality of the rear forkend with the number would never have been allowed under CB.

Royal Enfield is more likely than CB, possibly just post WW2 when components were short supply. Royal Enfield did produce a few lightweight bikes sometimes slightly non-standard.

Keith
 
Re: Possible Claud Butler luggless.

Thankyou Terry and Keith. I wasn't sure about Royal Enfield and the rear bridge are curved on the CB lugless. Will have a look for Mayfly and Bullet.
 
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Royal Enfield Firefly Deluxe. Found a picture on Google that vintage bike cave were selling. Same forks, frame and the same green as found on the forks all be it a minute piece. Not sure of the year or how the numbering system worked for them though. 1937-47?
 
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