The Horrors of Old Oil and Grease

These photos show old oil and grease in a watch. It's pretty bad here, but every old watch has some of this. This is why getting an old watch serviced is important, even if the watch ticks. Grit mixed in the old, dry lubricants turns to a very effective abrasive and grinds away at the moving parts.

It does not take long to damage something that was previously fine.