cazalea[Seiko Moderator]
17169
My experience is that kind of noise is often the rotor barely touching something inside
Oct 29, 2018,10:30 AM
It can be a loose pivot due to wear (very unlikely with a P15 as it's so new) and more often caused by a loose screw in the movement winding system, or even the hold-down screws of the movement.
Compare your watch to these photos of my watch using a loupe and good light. If you don't see anyuthing amiss when you carefully inspect the movement through the caseback, and the noise continues, you should probably have it checked out. A competent local watchmaker could inspect it for you - the El Primero movement is well known.
Here are some photos of my friend Moki's Tudor, whose movement screw came out and driftet over near the stem (thankfully not into the balance).