Condenser microphones (at least high-quality ones) aren't produced serially, like on a Henry Ford assembly line. Rather, capsules are typically built in one part of the factory by one set of people with one set of skills, circuit boards are stuffed in another area by different people with different skills, and exteriors (housings, screened covers for the capsule heads, etc.) in a third.
These subassemblies are prepared, then a batch of complete capsule heads is assembled and tested, as well as a batch of microphone amplifiers (with the two components not necessarily being built in identical quantities, since relatively more capsules are rejected, and relatively more amplifiers can simply be tweaked or have individual parts replaced to bring them into spec).
Then, finally, capsule heads and amplifiers are brought together and tested for the first time as complete microphones. At that point, sure, one of the amplifiers has been marked number 001 and another one has been marked number 002, etc.--but you can hardly say that microphone number 001 was built first and then number 002 second, etc.; it just isn't done that way.
--best regards