Omega Reference Number Question

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Good afternoon. I recently purchased a Speedy off of eBay. However, while I’m waiting for my new watch (idle hands) I noticed a discrepancy in what was listed and what is being sent to me.
Listed as 311.30.42.30.01.006 https://www.ebay.com/itm/1761974869...4GZd_RWR-q&var=&widget_ver=artemis&media=COPY

The case back of the watch looks like a 3573.50 with the “first and only” text on the back. I can’t tell if the bracelet has pins or screws. The documentation (including a previous authentication) shows 311.30.42.30.01.006 as the reference number. What do you all think? Am I wrong?
 
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Bracelet on that watch uses screws, as seen from the first link from the endlinks.

The "first and only" is correct for the earlier versions of the big box set sapphire sandwich. They removed it (recalling from the top of my head) sometime around 2016-2017, coinciding with moving the push buttons on the clasp to the center.

Everything on that watch looks correct.

Congrats on your new Speedy!