I had a tag 2000 in the 1980's that never hit the mark. I wrote to Tag and they said that there would always be some drigt but that the tolerances they worked to was that it should hit the markers around once very ten minutes...it never did as far as I could see. I did, however, follow it up and notify them that I had bought a watch in a market in Italy for around £2 that hit the markers bang on all the time, no drift, no excuses... :roll: