PIAGET very rare, probably unique 18k white gold ladies wristwatch with 2 time zones, manual winding, Switzerland around 1970, reference 1427 A26, 2 independent from each other so called Backwinder movements, winding & hand-setting on case back, case backs with dedication engraving 4-times screwed down, bezels lavish diamonds set, case & bracelet lavish decorated by hand, blued steel hands, each display of hours & minutes, movement numbers 713012 & 713026, calibre 2P, each 17 jewels, flat rim balance, Breguet-hairspring, incablock shock-absorber, adjusted in 3 positions, diameter approx. 20 mm, length approx. 17 cm, condition 2, collectable