1st Generation Magneto > 3 wire; we call this one the "Old Dad"

The "Old Dad" is the first design 2-coil 3 wire version in the history of China Doll engine magneto coils.

The White wire goes to a separate coil for the purpose of running a 6V headlight that most folks don't ever use so they just cut it off. 

6 mounting hole magneto.   SD mfg. brand; made years ago.   

Fits all 2 stroke China bicycle engines. 

Works with a SD or TZ manufactured Rotors.

Most of these magneto coils are coded with the  manufacturing date.