Must the writing instruments of a Marcel Proust Limited Edition set bear identical edition numbers, and are early Limited Editions possibly without numbering?

On an original set, all three writing instruments bear the same edition number; only then is, from a collector perspective, a complete set with corresponding value present. If the numbers are different, the set was subsequently put together, which reduces the collector value to the respective individual value. Particularly unusual is when the pencil delivered only in the set deviates. Early Limited Editions without numbering are possible; this should, however, in the individual case be confirmed by Montblanc.