Question on the AP offshore Chrono and new warranty card

[tough]

Hey all, hope you are well!

I am considering buying a ROO from a mutual friend.
It is the ref 26470ST, and I have a few questions.

The watch is very crisp, but the chrono needs a few seconds to be able to press again once its pushed in.
So once you START, it cannot STOP right away before resetting. It takes around 5-6 seconds before the "pusher" comes out and you can press it again, and then reset. Functions very well though.

Secondly, it comes with the new warranty card. How can I be sure what year/month the watch is from exactly?
It has a Serial number, warranty, and description but is not dated.

I apologize for the silly questions, but it is my first venture here.

Thank you all in advance!