Talking to a mate of mine and he said he had some RG500 cyls, another mate and i got excited... especially when he said one was NOS... cool... then we all realised we had no idea what they are worth, any one know?
He emailed me and said:
'RGB500 barrells,mark 5 mark 6 54mm dia. 1 X NOS marked E1 with matching NOS Head with removable squish dome. 3 X used marked E2 appear tto be 3/4 of a matching set 1 x used head. '