Who makes marathon watch movements?

Answer 1

ETA ( business title ETA SA manufacture hologere suisse). ETA is a subsidiary of swatch group and commonly makes movements for many of swatch group subsidiaries like OMEGA, and TAG to name a few. Specifically the Marathon watches have these movements:

Marathon Csar- ETA valjoux 7750 mechanical (automatic)

Marathon Gsar- ETA 2824- A2 mechanical (automatic)

Marathon Tsar- ETA high torque quartz (battery)

Marathon Jsar- ETA high torque quartz (battery)