Pre-WW2 BSA, something of a diamond in the rough I believe

Link to the 1938 BSA catalogue if you haven’t seen it: https://oldbike.wordpress.com/1938-bsa-catalogue/

You’re right that yours is earlier than this. The head clip headset is the giveaway, as by 1938 they had threaded headsets. However, that catalogue has all the models.

Good spot with the raised mudgard mount positions - that will definitely help identify the model.

Do your Lauterwasser bars have chrome under the black paint? If not, they might be off a later bike. I’m pretty sure the earlier ones were chromed. If it’s an Opperman, I don’t think those bars belong with it anyway. Lauterwasser bars came on the Sports models.

Have you got a better close-up picture of the head tube and lugs?
 
I am an early riser but this morning I was like a kid on Christmas day unwrapping presents but stripping a bike instead, it all came apart surprisingly easy although most thing had been soaking in plus gas overnight. The first thing I did was weigh the frame with the usual balance I use for bikes, the second was to put it on some scales as I thought the balance was faulty but they agreed at just over 1.7 KG which is incredible for a 90 year old bike and I am sure lighter than the RRA frame I had which was the same size.

IMG_20250728_070502236 - Copy.webp

IMG_20250728_070455502 - Copy.webp
 
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