The Ingersoll caliber IN 520 automatic watch movement is found in the Gun model IN1628BK. This movement is Chinese-made with 20 jewels.
Ingersoll watches claims this movement should stay accurate between -30 to +30 seconds per day when worn under normal conditions.
Instructions for Day, Date and Month Setting
To achieve an accurate day of the week setting, pull crown out to first position and turn the crown anti-clockwise until a day prior to the day you require is achieved i.e. if today is Wednesday then set it onto Tuesday.
Now turn the crown clockwise until a date prior to the date you required is achieved. i.e. today is the 16th then set it onto the 15th.
Push the crown back to normal position.
Press the top button to select the correct month on the 12:00 subdial.
Instructions for Setting the Year
Press the bottom pusher to select the year located on the 9:00 subdial.
Ingersoll’s Note on Automatic Movements
Automatic watches can be used only by those who are reasonably active as the automatic winding relies on a regular movement of the wrist. The watch must be given an initial manual wind of 8 to 10 turns and provided that it is worn on the wrist for a minimum of 8 hours each day it will continue to function indefinitely and may be taken off the wrist for a maximum period of 30 hours. If this period is exceeded the movement will stop and another manual wind will be necessary. It must be remembered that when worn in bed the movement of the wrist is insufficient to operate the automatic winding
In the Ingersoll manual, they state the following:
“Over wind of the spring may cause damage to the mainspring. Only wind the spring as far as it will go but not beyond.”