FOR SALE, VINTAGE CHRONO SUPER CALCULATOR CIRCA 1970. MECHANICAL MOVEMENT, CALIBER VALJOUX 774 (SWISS MADE). SOME PILOT WATCHES USE THE SLIDE RULE BEZEL. THIS IS A ROTATING BEZEL THAT CONTAINS A FUNCTIONAL CIRCULAR SLIDE RULE “A CALCULATION TOOL”. WORKS PERFECTLY, CHRONO OK, DATE OK. THIS WATCH IS …