I thought that myself, Andy, though the base does not seem to have much age-related wear - maybe it just wasn't used or moved around a lot. However, the stopper looks to be more recent in design than that (to me :spls:. )
The fit between the stopper and the neck is practically perfect, and neither have rough grinding marks, they're quite clear. On the other hand, the part where the base is joined though good, is not perfect.