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Term caliber is like a model number. For instance Omega makes a caliber 1000 and in that caliber family will be a caliber 1001 and a 1002. Think of the old days where Chrysler made Plymouth and Dodge and on some models it appeared as if the only difference was the badges on the hood. There are some differences but for the most part the parts for one will work on another. Then later Omega comes out with a caliber 1010. In this family there are also calibers 1012, 1020, 1022 and others. There are some differences such as a 1012 is a date model and a 1020 is a day-date, if I am remembering right. Again here most parts are interchangeable. Say you go to order a balance for a 1012 it will also fit all the other calibers but a 1012 part generally would not work on a 1000. Generally speaking if a manufactor made a change in the movement they gave it a new caliber #. If you should go to this link http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&136&2uswk&Omega_1000 you will see a picture of an omega 1000 plus the other members of its family. Knowing this makes it easier to find parts. This information is also obtained from other sources such as a bestfit catalogue. Hope I made since with this generalized explaination.
Charles