A. Lange & Söhne

Hello, Recently, I stumbled across a wonderful exploded diagram of the Lange Datograph (L951.1) movement - which can be seen as below for those who haven't: So I thought lets take it a step further. Why not try labelling all the components? This was my be...  

You just did what I've been thinking of doing for a long time. Thanks a lot for the detailed information!

Especially when considering the resource limitations. I immediately was drawn to what you have already identified as the click spring. BTW that is not the balance wheel; it's a crown that may be worn by the person worthy enough to be able to label all the... 

Apparently it is the clickspring, with the odd looking part next to it being the click. Regards, skyeriding

I shall read it again tomorrow, with anticipation ! Thanks for the post. Best Moritz

Well done and thank you for sharing it!

The lever next to the clickspring I labelled should be the click itself. Quite different than say, an 1815 movement where it's exposed and is finished to a higher degree.. Regards, skyeriding

And once more: It is far too late in the evening for me to digest all. I will certainly look again into your fantastic post. Best Moritz

...as I always thought it's weird calling it as one when it doesn't have four lobes like an actual Maltese cross Interestingly as foversta has pointed out before, newer L951 movements with longer reserves have removed the Maltese cross, as in this photo: ... 

If Lange has used this system (likely) than the answer to your question is: yes, the power reserve indicator can limit the winding. And even more: it can also do the same job as the Maltese Cross in using justvthe linear parts of the main spring. When you...  

I believe the term for this is called a "differential screw", which may be an older way of how power reserve mechanisms works. Off the top of my head, the only wristwatch I know using such a setup is the Bexei Primus. loupiosity.com Such a setup would... 

I would think that the rotations and teeth have all been calculated and that a full wind of the watch would limit the power reserve indicator "naturally". The definitive answer would be only available by Lange themselves, I guess. I am asking myself if La... 

Reinspected the parts picture and stumbled across this, cropped from the previous knolled photo: That's the differential gear used for the indicator. This is similar to the 1815 u/d as here: Interestingly, even in the first generation of the Datograph L95...  

The plate design makes me wonder if the first Dato was actually planed to have a pr indicator? Maybe Lange went for the Maltese Cross instead, out of design issues at the time? Best Moritz