Mechanical service is condition-based
A traditional service involves disassembly, cleaning, inspection, lubrication, reassembly and adjustment. Whether that is the right answer depends on what the movement actually needs.
Wear and lubrication matter
A watch may still tick with degraded lubricant or worn components. Continuing to run does not prove that the movement is healthy.
Sometimes replacement is the better option
On some common, widely used movements, replacement can cost less and provide a more reliable result than rebuilding a badly damaged movement. If we recommend replacement, we say so clearly.
Older watches need restraint
Vintage watches may contain obsolete parts, previous repairs or original components that should not be replaced casually. Cosmetic work is never assumed.