The last Seiko ladies' selfwinding movement is the caliber 4206(B). It measures a little less than 8 lignes in diameter, has got a ball beared quarter-arc rotor and can be handwound.
The enormous amount of functions is astonishing: It does not only display the hours, minutes and seconds, but also the date and bilingual weekday. Both can be quickset in the middle crown position.
The Seiko 4206B has got seventeen jewels, an excenter winding mechanism and a Glucydur balance, which is secured in two inhouse Diashock absorbers.