Chinese BHB Chess Clock.
This offering features an Chinese BHB Chess Clock. The black plastic case measures 6-1/4″ x 3-1/4″ x 2″ This Chinese-made mechanical analog clock features two wind-up mechanisms can be independently stopped by pushing button mounted atop the plastic case, which employs metal strips to engage one of the escapements, thus causing that timing mechanism to stop. There is a flag indicator to indicate whether the allotted time for completing a preset number of moves has expired. Both the movements are in good working order.
These Chinese BHB chess clocks are knock-offs and have been produced since around 1980.