I'll start with old and rare. First a trio from the "before we kicked out the non-Swiss competitors" era of COSC certification, when Seiko was playing... this my wife's watch but of course I bought it for her, just because it existed, I had to have it.
Comparable version in King Seiko guise.
And an even better movement in a Credor case.
Then a rare Sinn 8828ti chronometer which I don't wear often because the screw-down crown no longer has enough threads to remain engaged. :-(
An IKEPOD chronometer with GMT, charmingly named the SeaSlug
Purists P15 Zenith Chronometro
The big boy of the bunch but most commonly seen, perhaps, my Glashutte Original Chronometer in white gold blued hands.