A. Lange & Söhne

I need some help from members regarding my Pt Datograph. The watch is about 4 years old and I am currently traveling with it. It works perfectly during the day when I have it on but at night when I take it off, it loses time and in the morning is about 10... 

Because 10 minutes per 12 hours ( even per week! ) is not normal at all, of course. It is such an impressive outcome that I would first check if your watch has not been magnteized. Ask to any watchmaker, before. If not, I fear it is time for a service... ... 

Thanks very much for that. I did not think of the watch being magnetized since I have no problems when I wear it during the day. However, I think you're right - its time for service as I have never sent it in yet.

I think, a service in Glashütte is the best way to find out what´s wrong with the beautiful Datograph. Especially after four years of constant wearing the fine watch. When the Datograph is back it will be like new. Regards! Sascha

... the fact that it runs slowly over night might have someting to do with the low power reserve of 36h and the combined big date. The date change over night might cause the drop in PR ( because of some technical fault, maybe ) and that results in loosing... 

Thanks for the message. I was wondering as well why it does not lose time on my wrist during the day but only at night. I figured the power reserve was not adequate for some weird reason. Unfortunately this implies a bigger problem than the watch being ma... 

Alkis worked on my L1 and 1815 chrono this year, and I can attest that both he and Stacy execute commendable work and are consummate professionals. My Langes came back to me as new! Please be advised they are currently on annual holiday in Greece and will... 

putting the clock slightly tilted to one side and see if the delay increases or decreases the morning after. if it were magnetized would lose time all day long, you can always try to reload it before storing. I agree it's time to have a service.

... the same with shocks: makes the movement "gallop" normally. The suggested handling to see if it is position depending is not bad, but at a rate of 10 minutes plus a night, I doubt any impact. I have an Omega with the great ETA 2892-A2 movement ( Omega... 

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the cents? of your offering some truly excellent advice, based on well-founded knowledge and "hands-on" experience, with a play on words (from me, of course) with "rate stability". In fact, this would be exactly my own advice - again truly excellent - so ... 

... admiration for my bon mot and the expertertise that I share here. ( Modesty is my biggest virtue, as you can see ;-)! ) My sincere and collegial admiration to your's in the same way .... Regards Moritz

The watch need to be serviced. Fr.Xavier