The late model of the BSA airborne
bicycle is distinguished by the SINGLE THICK TUBE between the seat and the pedal
crank. The seat post slides right inside of it at the top.
Photo of an unrestored bicycle showing the silver BSA transfer on the seat
There is a BSA transfer (decal) on this single post, about halfway between
the seat and pedals, consisting of the BSA trademark of three BSA martini-Henry
rifles "piled" (forming a tripod) . The original version appears to be
in SILVER, whereas at least one replica version is in gold, with magazines added
to the rifles.
The wing-nuts on the frame appear to be plain without BSA raised letters.
The bracing for the crank consists of two round tubes from just in front,
angled back and downwards.