Ah, but it's not just a 6497 (which is itself available in a large number of grades and finishes). This is, to quote Eddie, a Panerai 'blueprinted engine' ...
"hand-wound mechanical, Panerai OP XI calibre with swan's neck regulator, 16½ lignes, 17 jewels, Côtes de Genève decoration on the bridges. Glucydur® balance with Nivarox® I spring, 21,600 alternations/hour.
Incabloc® anti-shock device.
Power reserve 56 hours.
Chronometer Certificate (C.O.S.C.)."
I am aware of several owners reporting +/- 1 sec accuracy.
Cheers