MERCURY RC1090 OVEN THERMOSTAT TH12 320C TH12
THE MERCURY RC1090 HAS 2 OF THESE ONE FOR EACH OVEN
WHEN CHANGING ALSO RECOMMENDED TO CHANGE THE THERMAL CUT OUT
WHICH IS THE LIKELY CAUSE THE THERMOSTAT HAS FAILED - https://www.rangecookerspares.com/thermostats-thermal-overloads/thermal-overload-th20
INSTALLATION INSTRUCTIONS AVAILABLE
TH12