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Swaps also can be made as the bike falls out of favor, or is being sold, where the higher quality components are traded for lower quality ones that the owner had onhand.
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For old Treks, 27.2 is the most common, but for other bikes the diameters can range from 25mm to 33mm.
The rear derailleur can often be dated to a year or two by referring to the book "The Dancing Chain - History and Development of the Derailleur Bicycle", by Frank Berto, 3rd edition 2009.
)Most early Treks (1976 through about 1980) were sold as framesets.
The components were added by the local bike shop or by the buyer. Components also could be swapped from an existing ride to the new frameset.
The rear derailleur freewheel/cassette and chainwheels are probably the first to be changed on a bike.