Clive, that is exactly where it should be, it is a production run No. There should be another marking, also on the inner rim near the wearers ear. I would guess a 'Q' number, Quist. Maybe a 62, 64, 66.......to donate size, I cant read the sz on the liner, but if it is 56 or 57, then the shell would be a 64. hence 'Q64'. a 58/59 liner would be 'Q66', 54/55-'Q62' and so on. Hope this helps.
Regards Mr Slug.
Regards Mr Slug.
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