Почему у красноармейца Сухова из фильма "Белое солнце пустыни" такие огромные часы?

I'm sure everyone has seen the Soviet film "White Sun of the Desert," and perhaps you noticed the giant wristwatch worn by Red Army soldier Sukhov. Many have probably wondered why he wore such an awkward watch, as it looks a bit outlandish. Especially when compared to modern wristwatches. Perhaps it's a Casio from the Civil War era?