bobbee
Posted April 9, 2013 - 2:03pm
The automatic movements used in Bulova watches are all bi-directional rotating/charging, and the Duo in Duo Wind probably refers to the ability to wind the watches by hand as well as automatically. The change from Duo Wind to Self Winding is probably just an update to the wording on the dial, as we see 1952 ads for Duo Wind watches with "SELF WINDING" on the dial.
This is just my opinion, of course.