I did not find the number, but only the inscription "PROTEXO + PATENT + SWISS MADE". What would that mean? Could someone explain the inscription on the buckle?
The bands i have are not branded protexo only brevet and nr.
The bands i have were deliverd to Swedish market in early 40s. Many years ago I found a tray full whit Nivada nos waterproof watches delivered to Sweden 1941 whit this bands.
I would like to know whitch material it is.
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