Stumbled upon this interesting website thanks to Google Translate
Which the author claimed the 429 was the pinnacle of Orient 18000 bph movement before the quartz crisis, when they modified Seikos 70 movement to the 469 we know now, circa 1977.
Interesting features include the thinness of the movement, and a two layer 4th wheel or whatever it is.
Anyone with interesting King Divers Chronoaces to share ?
I found this piece in the local ads and am wondering if I should bite.