Hi Paul,
People often do think that this family shares a lot parts, and they do, but not as many as is often assumed. Both of yours are based on the Cal. 260, but the 266 and 268 do have a number of parts that are different from each other.
As you noted the balance is the most obvious, as this has a smooth balance (no screws). This of course means the parts of the balance are different as well, so the balance wheel, balance spring, staff...
But in addition there are a few other parts that are different between the 266 and 268:
- wheel train bridge
- center wheel
- setting lever
- setting lever spring
- mainspring
- barrel arbor
- barrel drum
Yes the balance jewels consist of the cap jewel and the hole jewel in commonly used terms. Omega refers to the hole jewel as the "in-setting"
Not sure if you need both cap jewels (upper and lower) but the the part number for the balance side is:
72201001343 | CAP JEWEL FOR BALANCE UPPER
Unfortunately this is a discontinued part, and Omega no longer has a replacement available, so you will have to look for it on the open market.
Looking at some old Incabloc charts, it appears that the top stone (dessus) is Incabloc part #121.11, so you may be able to find it under the Incabloc number.
For the lower cap jewel, it is also discontinued, but Omega has a replacement for it - it's actually from the modern Cal. 1120:
722112070900 | CAP JEWEL, BALANCE BRIDGE SIDE
Yes it says it's for the balance side, but that's on the Cal. 1120, and on the 268 it's used on the main plate (lower) side.
Hope this helps, and happy holidays!
Cheers, Al
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