I saw this 16528 piece W series with inverted six dial from 1995. Is the dial correct for the model? I read at various places it says inverted six dial is only up to series S, but many reputable places selling pieces from W or later with inverted 6 dials. Is it a given that any pieces after series 6 having inverted 6 dials means that it has replacement dials and not the original dial? pls advise. Thanks