Hi Bernhard,
I had no idea that the early fibre type liners also had this feature!! (as both my examples are two piece popper fitment)
would it have something to do with different makers using different methods to do the same job!!??? I always thought it was only Ulbricht´s made the fibre type????? and as the second type grey thermoplastic M58 liners weren't mostly marked...... the same!! (I do however have a couple of M58 grey plastic liners... retro-fitted with M75 leather and wide webbing crossbanding.. AJ 94 stamped to the leather .... but.... with SW 71 marked in the liner!!?? ....Shuberth?? Germany??? see pic)....
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