Do all Constellations have the observatory emblem?

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You’ll notice that the reference is 166 not 168 and that there is no ‘officially certified’ on the dial. omega did produce constellations without chronometer rated movements (in mid 70s?) which is why there is no observatory on the back.
 
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Marine Chronometer and and MQ model do not have any logo on caseback. I also have various f300 and Megasonic with no observatory. I assume you are referencing the classic Connie, eg pre C case?