Cairns 5A Leather Helmets (Pre-Crash Cap)

vbcapt

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Apr 9, 2007
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On the underside of the leather dome is the Cairns metal disk or foil disk. Some of the disks have a small letter on the left side. I was told that this letter indicates the time period when the helmet was produced, anyone know for sure ? If that's the case would anyone here know the times periods for each letter on the disks ?
 
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