Guys,
Give Stu a break... he enjoys busting balls at times just for giggles.
I have pictures here of a friends original IBM's. The early bands all show 2 large circular weld spots just like the one on GB. On 2 of the bands the weld spots are placed farther back toward the ring that overlaps the front of the handguard, but on the other 2 the 2 weld spots are more towards the front lip of the band just like the one on GB.
These bands look to match the color of the one on GB.
I can't make out his KVB swivel markings well enough to see if they match the one on GB. But all 4 swivels are lighter in color than the bands are.
Could be possible that the band was missing it's swivel and one with more wear was attached to it.

FWIW,
Charlie-painter777