145.006 / 145.016 Seamaster Chronograph Research Thread

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Always enjoy returning to this thread. I had a quick question - are the .006 and .016 cases effectively interchangeable, other than the model number? Would an .006 case fit with an .016 caseback, or an 861 movement?
@Archer once told me that these references return different parts from Omega database.

Few macro shots to this topic, too.
145.016 1969