I'm hoping that the Omega AD will sell the watch with the full warranty so if anything does happen it should be covered. Do you know what the issues were for this chrono?
There were several parts that were upgraded over the life of this movement.
1 - Screw for hammer-lever banking bridge - screw strengthened due to the head snapping off on earlier versions.
2 - Column wheel operating lever - stronger version to prevent bending of the lever, which would make the chronograph inoperative.
3 - Minute counter jumper - modified to prevent the jumper from breaking off, rendering the minute counter inoperative.
4 - Hammer operating lever - first iteration would bend, the second iteration was made stronger, but resulted in too strong of a reset of the chronograph (hands would shoot past zero too far and not be centered). The third one is the Goldilocks version - not too weak and not too strong.
5 - Rocking bar - new version prevents potential bending of the setting lever.
These are all of the upgrades to the swiss lever escapement versions of the movement. The co-axial watches had other upgrades related to the co-axial design, but are not relevant for the watch in question.
Note that all of these chronograph upgrades were completed in models produced after the middle of 2008, so if the watch was produced after that, all these upgrades should already be done. These are considered mandatory upgrades by Omega, so if the watch went back for servicing at Omega or at a qualified independent watchmaker, the upgrades would have been done at the time of the last service (I have done these upgrades on many of these movements over the years).
I have serviced quite a number of these movements, both co-axial and Swiss lever versions, and there has only been one that has crossed my bench that actually displayed a problem related to the parts that are upgraded. This is that movement:
If you look at the hook that grabs the column wheel to turn it, the one on the left is just slightly further away from the column wheel teeth than it is on the right. This is the column wheel operating lever, and the one on the left came into my shop bent. The new version was installed and it worked fine after that. Here is a video showing the operation of the column wheel after the part was changed:
It should be noted that over the years there has been a concerted effort by one individual on forums (he's a member here also, but not very active) to paint this movement in a negative light and as being particularly problematic, when that really is not the case. I can't say for sure how many I've serviced, but it's a good number, and only
one has ever had any problem related to the upgraded parts. Omega changing these parts is a sign of them being proactive more than anything else.
Hope this helps.
Cheers, Al
