We do not test items to see how long or how accurate they run. All items we sell have had a previous owner(s). None, and I'll repeat it, none of our watches online are currently serviced unless they state so in the description. To get a watch overhauled (timing etcetera) it costs 3-400+ not including shipping both ways. If an Item that is listed states, "Running", it simply means that when wound or plugged in that it is running, not guaranteed to keep time, just that it started to run. All items are being sold AS IS.