skyeriding
901
I wrote about this topic awhile back,
Here (perhaps a shameless self-promotion...):
EDIT: After re-reading your question more carefully, with relevance to if there is any incremental changes to the L951.1 alone, then only point 1 below is relevant. The other changes are incremental updates as the L951 got upgraded to the L951.6 in the Datograph up/down later.
Though, I feel the writeup is a little outdated after seeing more examples online. The summary of changes visible for the movement (notably from L951.1 to L951.6):
1. Operating detent spring mounted on baseplate, now swapped orientation onto the lever itself (as circled in your pic). It appears this evolution also happens during the L951.1 period itself - as in both your pics which are both Gen 1 Datographs (non Up/Down).
There is yet perhaps, an even older iteration of the detent spring design which can be seen here: www.watchprosite.com
2. L951.1 has 40 jewels, while L951.6 has 46 (evidenced by font on the bridge). I do not know where the extra 6 rubies go to.
3. Most notable change - L951.1 is a traditional, screw-poised and regulator balance. The L951.6 is a more modern, free-sprung regulatorless watch (thus, the swan-neck is to adjust beat error, not as a regulator).
4. L951.6 has a buffer detent spring built into the reset hammers (refer to the old article above)
5. L951.6 has an updated power reserve over the L951.1. I believe it is due to the removal of the stopwork maltese cross mechanism.
Regards,
skyeriding
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Does anyone know whether the original caliber L951.1 underwent any changes during its production? The following are two pictures of L951.1. From what I can tell, there is at least one difference (red circle). Any information would be appreciated. ...
I wrote about this topic awhile back,
Here (perhaps a shameless self-promotion...): EDIT: After re-reading your question more carefully, with relevance to if there is any incremental changes to the L951.1 alone, then only point 1 below is relevant. The other changes are incremental updates a...
Excellent!
This is just the type of information I was looking for. Thank you for taking the time to put that into writing.
Maltese cross is something representing the wisdom that people used simple method to overcome material issue.
Although it's no longer a must, I still consider it to be a shinning point of Datograph. So is the screwed balance wheel.
I used to study on it a little bit
But my original post was in Chinese. Sorry! www.ctime.com