Sale! Hamilton Chrono-Matic Ref. H51616731 $2,545 $2,036New Hamilton 48.5mm Chrono-Matic Black and White Dial, Black Leather Strap H51616731The Chrono-Matic 50 is based on a vintage version of the same name and is limited to 1,972 pieces. This modern automatic chronograph is powered by a caliber H-31 that is based on a Valjoux 7753 that Hamilton enhanced to improve the already robust movement by extending the power reserve to 60 hours. The case measures 48.5mm, which is a large size but with integrated lugs the watch wears comfortably. The classic reverse panda dial adds a touch of drama to this limited edition and is accentuated by the bold red color accents, including in the countdown scale. The pushers on the right side of the case operate the chronograph whereas the left side are used to rotate the inner bezel and set the date.