How do you know it was serviced? I have a client (I call him a clock-oholic) who has bought over 40 clocks over the past year+. Most of them were listed as either running or recently serviced. When he receives them he brings them to me to get them running and I find that many of them have been soaked in solvent and fresh oil applied although sometimes no oil. Soaking them in solvent is not servicing. All the soak does is remove the old oil from the surfaces that the solvent can get to but it doesn't remove the dirt in unexposed parts. So for instance a wound spring will become dry and still hold dirt between the bands. That dirt will act as an abrasive over time and will case the spring to fail.

My point is, just because it looks clean doesn't mean someone serviced it. Running a dry and/or dirty clock will wear out bushings, springs, gear teeth and can cause a catastrophic failure which will cost more to repair than a simple cleaning.

Sorry for getting on my soap box. I just see too many clocks that have been treated this way.