We live a couple of miles from one of only a few a watchmakers in our very metropolitan area. Because droplets of moisture have sometimes gotten into the watch and condensed on the inside of the crystal, I wanted to talk with him about cleaning and lubricating the watch. The watch also stopped recently, but I got it going again by gently poking with a toothpick at the wheel that drives the second hand. I thought there may be a tiny piece of debris inside the watch, and cleaning would be a very good idea. The watchmaker has a very thick foreign accent and shook his head, "No!" when I asked about cleaning. He said, "New battery! One year!" When the watch was new, the first battery lasted 7 years. I have 3 1/2 years on the present battery. This watch is still supposed to keep accurate time when the battery is getting low, but the second hand begins to jump in 2 second increments every 2 seconds as a sign the battery needs to be changed. I have not seen that, yet, so I assume the battery still has some life in it..Still, some sites urge replacing the battery every two years, even if no inaccuracy problems are evident. I do not know if it makes a difference, but the watch came with a silver-oxide battery. The present battery is an alkaline battery.
Spanner wrench to remove the back
Ballpoint pen or jeweler's screwdriver to depress the stem lock
Canned air with a guide tube
Rubber cement or a properly sized "O"-ring
The photo shows me pretending to be a watchmaker.