Yes i can say for sure buy the book, not only does it help tremendously its also a beautiful item in its own right. Just like Heurs infact! Ive no idea why i waited several months to get one...!

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.