Is this legit Omega bracelet? NSA made?

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I got this bracelet on a Quartz Constellation ref 198.0114ST from about 1979. It's 19mm wide in the endlinks. I think it is NSA made bracelet, and the clasp seems to fit very well with the rest. What do you think, is it a real thing or a franken of some sort? No ref numbers on the clasp.
It was pretty grimey when I got it, so it might have been with the watch head for a long time.