Tariffs, customs, duties, taxes

I live in the US. I’m traveling to Europe next month and one of my visits is to the Longines factory. I’m bringing my Longines chronograph with me and I’m considering leaving it with them for service to the movement. I’m not purchasing a watch there, just having mine serviced. Does anyone know what fees (tariffs, customs, duties, taxes) I may be responsible for in addition to the watch service itself? Thanks for any input.