"Wig-wag" self winding wristwatch, patented in 1931....
"Wig-wag" self winding wristwatch, patented in 1931. Employs
"Wig-wag" self winding wristwatch, patented in 1931. Employs 'roller winding' in which the entire movement slides back and forth to wind the watch. Serial number 1743691; patent number D.R.P. 529785. Case hallmarked for 1931.