Fuel/gas cap chain variations

[zed2]

Here are three (3) variations of fuel/gas cap chains used to attached the cap to the retainer ring. Does anyone know the model year/series/production year of the various chains.

Thanks,

Keith

[w3wilkes]

My Series 1 12/70 car has the chain on the right, 6 pieces plus the split ring.

[Zpenman]

My Series 2 (07/71) car has the middle chain, although it's quite oxidized compared to yours.