Legibility is better in person than the photo, but the contrast remains challenging due to the monotone dial-hand tandem.
This is the kind of watch that you need to view, focus, and then discern; a quick glance will not do. Of course, if you plan to read the perpetual calendar precisely, a still-higher level of effort is required.
I'd compare the contrast of this AP to the post-2017 Rolex Yacht-Master II stainless steel with its WG-on-white hand/dial combo. Better photos of that watch are available online than any imagery you'll find of the AP, so check out a current-spec steel YM2 photo in high resolution as a test-case to determine whether this AP meets your standards of legibility.