Mercian
Cruisin' on my Bluebird
Hello Jim, and Welcome
Your R57626 is near the end of production, and, as you say, will probably be a 1944, though the final proof of that is not yet available.
The closest survivor I know of is R57631, which 20+ years ago belonged to a guy called Brian Asbury in ON, Canada.
More recently it was reimported to the UK, then sold on. Here are some detail photos of it, though it seems to have spent a lot of time outside....
onlinebicyclemuseum.co.uk
As to parts, I can point you to sellers of reproduction grips and transfers, and possibly saddles. Also original brake blocks. BSA marked air pumps the right size are very rare, though other period british makes of that size can be found more easily.
Brake calipers turn up, but are expensive. You may start with a free 'wanted' advert on this site.
I will send a personal mail here now, see if you can respond to it.
Best Regards,
Adrian
Your R57626 is near the end of production, and, as you say, will probably be a 1944, though the final proof of that is not yet available.
The closest survivor I know of is R57631, which 20+ years ago belonged to a guy called Brian Asbury in ON, Canada.
More recently it was reimported to the UK, then sold on. Here are some detail photos of it, though it seems to have spent a lot of time outside....

1944 BSA Airborne Paratrooper & Junior Pegasus Parabike – The Online Bicycle Museum
1944 BSA Airborne Paratrooper & Junior Pegasus Parabike

As to parts, I can point you to sellers of reproduction grips and transfers, and possibly saddles. Also original brake blocks. BSA marked air pumps the right size are very rare, though other period british makes of that size can be found more easily.
Brake calipers turn up, but are expensive. You may start with a free 'wanted' advert on this site.
I will send a personal mail here now, see if you can respond to it.
Best Regards,
Adrian