The reason I'm asking is because what happens to a chronometer when you take it in for the 5 year service? Should I expect it to come back within the +6/-4 specifications? I have a Hamilton Intra-Matic that, even though it was NEVER an official chronometer, ran very close to those measurements. I took it in to Tourneau for its tuneup and now it runs at around +12. I'm not as happy as I used to be.