Omega Constellation 14393 restoration

Thanks. Is there an article somewhere that explains when and for which watches the end links were produced? I have found several different ones that would fit a 14393, but would prefer one that was produced around the same time as the watch.

I have sent the 14393 Constellation to Omega for service before the Covid shutdown and haven't heard from them anymore. I asked for a quote and not to polish the case and some other details. I have been able to find its newer version (168.005) with the same dial, however. They will make a nice pair once serviced. The older one will be restored with the original bracelet type that it came with. The new one with a 7row BOR.

I am still not sure what the best way to get them serviced is. I don't know any good watchmaker here in Switzerland (I know ironic since Switzerland is the home of Omega), but would prefer a local one that I can talk to and not Omega service. Can anybody recommend me someone in Switzerland.

PS: interesting difference of the dial is that there is a marker to the right of the date window on the 168.005 while on the 14393 there is no marker.

And here is the 14393 again for comparison...