Although not quite as accurate as the 992, the 17 jewel Hamilton 972 pocket is a robust easily serviced and repair timepiece. This one was quite dirty, and the oil had dried up freezing the gears in place. After cleaning and adjusting the balance jewels, it runs great.
Dried oil on jewel holes 
Sticky dirty grease in the mainspring 
AFTER CLEANING:
Jewel holes after cleaning and hand polishing 
