Seiko pulsations automatic chronograph

Vintage Seiko pulsations automatic chronograph model 6139-6022 from the 1970s with black dial and Spanish/English weekdays. The watch works nicely but it doesn’t reset back to 12. The service history is unknown. The watch has been cleaned and the gaskets have been changed. The plastic glass has been polished. The watch comes with new black lizard leather strap. The watch has not been waterproof tested.