Is this 580 end link genuine?

Hi Rolex experts

I recently purchased a Speedmaster from Japan and it came with a 1171 bracelet with one 580 end link on it.

Is the end link genuine Rolex? Almost all examples I could find on the internet don't have the spring bar cut-out on the back side but just a straight edge.



The only one that I could find that resembles mine is on this site here: https://www.rwg.bz/board/index.php?...-always-swapping-out-endlinks-on-their-1680s/

But I don't understand half he's writing there. Is he comparing two aftermarket end links?

Thanks!

Thanks. Goes to the metal recycling bin then.