Just wondering if anybody can shed light on the different f1 variation's ,my pair are dated 1987 and i think 1988 or it could be 82 ? both show a slightly different star crown pad ,extra vent holes on one example shows the earlier chinstrap and the other the latter ,just wondering when this changeover occured also the rear mount has a pop stud not found on my other example ,my guess is for hanging the lid off the webbing but im not 100%
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