2561.80 genuine bracelet?

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hello everyone, i've just buyed a seamaster 2561 on chrono24 by a private seller.
the watch seems ok but i have some doubt on end link ed clasp

the end link is different from the other i see on the web, have the ref 824 in the middle not in the corner like the other.
the clasp, this have ref 23s written, meanwhile the clasp seen on web have n. 32
is genuine 1502/824 from a seamaster 300 or is the bracelet of other ref number?

thank's everyone