A riddle for me, for you too ?

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Dear community,
i bought a nice Zenith XL Tronic, pictures will be added as soon as the watchmaker has changed the glass 😀

The Zenith had an NSA braclet with an unknown sign for me. I thougt ok this could be a personalized clasp with the letters of the owner. A few days later, swimming in the bay, i found the same bracelet with the same sign on the clasp. The seller was from uk i live in germany.

Any ideas about the meaning of these sign or maybe a watch company with similiar letters ?

Last but not least some pictures:


And pictures from the bay: