Two lady's diamond bracelet watches one by Concord for Tiffany & Co., the other by Piaget

Two lady's diamond bracelet watches one by Concord for Tiffany & Co., the other by Piaget
The first with circular silvered dial and black baton markers, within a brilliant-cut diamond-set bezel, the seventeen jewel lever movement adjusted two positions, to a flexible brick-link integral bracelet, circa 1970, case 19mm wide, bracelet 17cm long; the second with rectangular champagne dial and dot markers within a brilliant-cut diamond bezel, quartz movement, to a tapering flexible integral bracelet, circa 1980, case 20mm wide, bracelet 15.5cm long
The first watch, dial signed Tiffany & Co, case and movement signed Concord, the second watch, dial and case signed Piaget