core 'revision' number...BS? BUSTED!!

In a perfect world all the blocks should be the same but those molds and cores were hand made back then. Nowdays they are made/machined on concrete Milla and all the components are close to perfect. But still. If a little material needs to be added here or there a slight revision is done by hand. Now, that being said, all the components may be interchangable but a certain combination of those parts may produce a slightly better piece. Core shift could happen to any core box or any mold or any combination of components.