Omega 1120 Inca Chaton (jewel hole)

Deggsy1969 · Nov 10, 2025

I have another question please… I think I know who might kindly answer🙂

I need confirmation please that the jewel hole (chaton) for the upper Inca shock (balance side in case I’ve designated incorrectly) is Inca part number 111.09 as used on the eta 2892A2?

The reason I require confirmation is that cousins do not show the omega 1120 in the ‘calibres where used’ list for the 111.09 chaton

Any help gratefully received please 🙏

Kind regards Darren

Archer · Nov 10, 2025

I don;t think I've ever crossed referenced it to the actual Incabloc number, but the Omega number is 722112070640 for the balance bridge side (upper). For the main plate side (lower), it is 722112070641.

What I can tell you is that prior to the 1120, Omega had the 1109, which was a 2892A2. The Incabloc numbers are the same on that caliber, so by way of inference, the 2892 Incabloc number should work in the 1120.

BTW just in case someone is looking for the cap jewels at some time in the future, the upper cap jewel is Omega 722112070900, and the lower is 722112070901.

Deggsy1969 · Nov 10, 2025

Thanks so much for a detailed reply as ever Archer. You’ve been an immense amount valuable and sound advice to me of late and I’m very grateful to you 🙏