To be fair, it was not that long ago when I would have been fooled by this monstrosity. ebay was alerted to this scam, but, apparently, they sided with the seller & let the auction conclude.
Remove the movement from the case & then remove the second & minute hands (the Watch Repair forum contains stickies with instructions).
Then, with the stem pulled out into the time-setting position, s-l-o-w-l-y turn the hands until the date just switches over (you may need to do this a few times to get used to where it changes). Place the minute hand lightly (not fully - you may need to reposition a few times) onto the center pinion & run the hand through a 24-hour cycle to be sure the date now changes within 30 seconds +/- of midnight (this is the spec for Rolex watches). If incorrect, remove the minute hand & repeat previous steps until you are satisfied with the hand's position. (Note that anywhere within 2 minutes +/- midnight for an unserviced rep movement is generally acceptable.) Press the hand down gently (never press hard), followed by the second hand & recase the movement.
While I am not sure about the package (I have never a Rolex package with the printing so far off-center), the T21 looks gen to me. At least the beveling looks correct. But the only way to really tell is a side-by-side comparison with a known gen xtal. So, as always, buyer beware.
A DW quality PN dial with the correct 'long-tail' 3 in the minute totalizer subdial (without adding the usual 2 steps backward for every step forward)
(This is what it should look like)
Unless the watch was just serviced.
I do know what you mean though. But there are plenty of examples on those other (gen) sites of well-worn vintage pieces with pristine xtals. I guess it is up to the look you are after. For the most part, I tend to side with the worn insert/clean crystal crowd & I do not think it works against me
(these bezels/inserts/pearls are gen, as are the xtals (except for the 1665, which is Clarks))
I cannot remember who it is, but, believe it or not, there is another long-time VRF/TZ member whose Daytona collection puts even Zane's massive collection to shame. He does not post pics often, but when he does, they usually stop me dead in my tracks.