Perry & Glenn, I did my best to find a clue of that on the lining ; I double checked with the UV (insignas, liner...), nuts. I checked closely at a possible opening, no more luck on that ; a total replacement of the liner can also be imaginated, but it would involve so many different parts of the cap inside and out that it would be noticeable somewhere for sure...
Here are some views ; the stitching of the liner in front of the cap :
Here are some views ; the stitching of the liner in front of the cap :
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