[FerrousMaelstrom]

I think it's way more likely they'll pass the Ghost watch around than have two - I can't think of any duplicates other than the ride vehicles from Gaim.

The Ghost thing is an interesting question. I guess Geiz could have done it himself (similar to what happened with Specter) but if Takeru with Ghost memories shows up in the movie (and, as per usual, the movie is set at about the same point in the series as was airing when it was released in theatres), the timeline is going to be pretty screwy. Actually, it will probably be that, they're clearly fine with screwy timelines.

Alternatively he could have stolen it from Oma Zi-O but in order for that timeline to make anything even resembling sense, present Sougo would still have to make the watch for Oma Zi-O to have it, to be stolen.

Or Takeru could turn up with no Ghost memories at all (in the present).