I've had the pleasure of "watch-sitting" my father's 3940R perpetual calendar in recent weeks. Today, for the the first (and only) time I had to manually adjust the date on my own 5056P annual calendar since purchasing it late last Spring. Pretty cool to see them both side by side on March 1st, after the 3940 rolled over "magically." Couldn't resist the opportunity to admire (and share a snapshot of them) them side by side! 