Omega Speedmaster Bezel and Crown Variations

Pierre37 initiates a detailed inquiry into the subtle variations found on vintage Omega Speedmaster bezels and crowns. His post highlights specific characteristics like the 'dot over 90' and the presence of accents on 'tachymètre,' seeking to establish a chronology for these design elements.

HI,

 I have 2 questions about Omega speedmaster :

•      The first question is about the bezel : I can't define chronology. I read on "chronomania" (a French watch's forum) that the accent on the word "tachymètre" seems to have disappeared in 1969 to re-appear in 1996 (although that all the people doesn’t agree with this hypothesis, I think that it must be correct) however I haven’t any information about the dot upside or on the right of the “90”.

Ex :  105003 with dot on the right of the 90 

  There are many examples like this with 105012 where the dot of the 90 is sometimes upside, sometimes on the right…

•      Second question is about the crowns, I think there are 3 kinds of omega speedmaster ‘s crowns  :

First, is the recent crown (with well rounded omega logo), ex :

=> I would like to know since when this kind of crown have been use ? 

And 2 kinds of vintage crowns but I don’t know when one or the other have been used (I see 105012 with the 2 kinds of crowns).

Ex : (the vintage big size Omega logo, picture credit : 105012 of did on fam).

Ex : (the vintage small size Omega logo, picture credit : 105012 of valentin33 on chronomania).

If someone knows answers

Sorry for my my approximate English

                    Thank a lot

                           pierre37