GE 50 Amp 240-Volts Double Pole Ground Fault Breaker with Self-Test
You will find that General Electric is the brand behind this breaker, which I have seen in many homes.
GE 50 Amp 240-Volts Double Pole Ground Fault Breaker with Self-Test
GE 50 Amp 240-Volts Double Pole Ground Fault Breaker with Self-Test