Me neither....According to Roy Bacon the Super Flash was announced in 1953, and used a modified Plunger rear section frame, plus its own unique front section. Super Flash Parts are listed in the '49-'53 parts book, pages 59-61.
Standard Plunger or "Sprung Frame" numbers include the letter "S" to denote a sprung type frame. No "S" in the number means the frame was originally a rigid. All standard frames are marked with a year letter, then A7 then S if a sprung plunger type, followed by the frame number. Frame numbers do not indicate whether an A7 or A10 engine was fitted.
Superflash frame front section is identified by the characteristic swan neck saddle support tube. This front section is part no 674141. Rear section is 67 4142. Oil tank is 67 8362. This looks very similar to the standard tank used on the early rigid A7, and is larger than the standard plunger tank. B and M series tanks are also worth a look.
Sorry, but I have no information on frame numbers specifically for the Super Flash, but no doubt the series key will be along soon. BA10S would indicate 1953 year letter, A10 to denote a unique application, and S for plunger sprung rear.
Swarfy.
Additional. Just noticed the parts list indicates engine steadies to the rear of the motor, the list says other parts are standard A10, so it has both front and rear steadies. Fronts clearly visible on published information, never the rears.
