Help Authenticate YMII

[biochembro]

hi guys

long time lurker, first time poster. I'm currently looking to purchase my first (non-sub) Rolex and want to know what you guys think of this SS YMII a third party offered to sell me

-I'm pretty decent at telling apart fake subs vs real subs, as there's an abundance of info available online. however not near as much info available for Yachtmaster II's.

-I havn't seen the watch in person yet; plan to friday (it's out of state, can't use my trusted AD/RSC)
-The watch comes with papers and box

-i'm trying to get the serial number and run it by my local RSC (i'm in Lititz, PA)

-Hopefully with any info you guys can give me, plus meeting at an AD for a "service quote/appraisal" i'll be able to authenticate it. from research this watch should weigh 179g, so ill probably buy a postal scale and bring it; if anyone can verify that it's much appreciated

Thanks