For those of you who have Arno Haslinger's amazing Heuer Chronographen book, check out pages 72-75 for this bezel subject.

On pages 74-75 there is an 11630 GMT which certainly has the flat bezel which doesn't fit flush into the bezel metal part - there is a great detail photo on the bottom corner of page 74 showing this.

Then on pages 72-73, it really looks like this is an 11630 with a bezel that fits flush on the outer edge and is slightly angled. There is no detail photo so hard to be 100% sure, but certainly looks like the bezel is not 100% flat.

For those of you that don't have Anro's book, I'd say :

- if you do care about something so obscure as the angle of inclination of 11630 bezel inserts, why don't you have the book? You need it... don't wait - just order it now!;

- if you don't care that much about the minutia of Heuer bezels, but just love Heuers, you should get the book;

- if you don't really care that much about Heuers, this probably isn't the thread for you.