decksurgeon
177
excellent question & astute observation..... need to check this out in-depth
as I have not noticed myself till you mentioned it.
From observation of the pictures in possession, I can conclude that:
(1) that the chaton group that is perhaps "variable" is shown with RED arrows below.
the blue arrows show the jeweled section of the watch that is consistently the same regardless of case material.
but I cannot conclusively convery with 100% confidence the following as it may be due to pure chance:
(2)The S/Steel pieces with Cal 100 dont seem to have this group of chatons while the photos of the non S/Steel possess this
(or simply dont have enuff photos of cal 100 watches to make this grand assumption).
does anyone here have a Cal 100 watch in S/Steel possessing the chatons shown by the RED arrows? that would certainly answer a lot of questions 
Refreshing post - thank you!
By: respo : July 13th, 2009-08:22
Thank you for your post on the GO Calendar Week. This is one of my favorite watches and we do not speak much about it here. There is also the ALS 1815 KALENDERWOCHE, but IMHO no other calendar week watch compares to the movement inside the GO Calendar Wee...
nice review
By: cuibono : July 13th, 2009-11:08
as i've written elsewhere, my mechanical interests are fairly rudimentary compared to 99% of you folks, but the aesthetics of the calendar week watch have always caught my eye. it just looks great, and i loved the double big date approach. that always str...
Nice report. I own one...
By: Goh : July 13th, 2009-21:31
even though I live in Singapore as well , as I am attracted by the aesthetic of its dial – clean and understated. I don't use the functions on most of my watches anyway. At least I have the very useful panorama datum and day functions on this piece. Goh...
Thank you very much
By: stromer : July 14th, 2009-23:07
..., Decksurgeon, for pojnting our attention to this exceptional complication and for your fine report! It is really amazing how complicated the calendar week feature is executed in this watch and how well this complexity is conceiled. Here in Germany eve...
some more pics ...
By: 5th element : August 1st, 2009-15:00
Hi, I am pleased to see that this very much underrated model receives some additional attention here. Let me add a view pics from mine, here in Germany. I also add the picture I have received from GO, explaining the complexity of the watch (unfortunately ...