Seiko spare part 383700 (1 piece) – Setting lever for caliber 5717 / 5719 / 5740A / 5740B / 5740C – NOS

Original Seiko spare part 383700 from unused old stock (NOS).
This is the setting lever for the classic Seiko movements 5717 , 5719 , and the variants 5740A , 5740B , and 5740C . These calibers belong to Seiko's historic stopwatch and chronograph families of the 1960s and are particularly sought after by collectors and watchmakers.

The adjusting lever is brand new, unused and in excellent original condition – a rarely available spare part for these early Seiko mechanisms.