Helli.
Omega changed black onyx inserts to black paint starting with movements serial # 24 mil and most of them are 561's.
Some sellers (and collectors) prefer 564, they swap a 564 from a C case and voilà, you have a nice piepan connie black onyx inserts and a 564.
Any 168005 with black onyx inserts powered by a 564 ,serial # higher than 24 mil must be one of them.
Best
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