According to the UG documents, the 68/69 are identical to the 218/218-2 except for some auto components.
Again, from UG, the 218/218-2 are identical to 215/215-2 except for some barrel, regulator, balance components - plus a few others but, not the minute wheel.
So, it should be a 215/215-2 minute wheel and that would be part number 260. If the last link you show is really from a 215, then it should be suitable but, it doesn't look in very good condition.
As
@Larry S says, find a watchmaker who will locate these parts for you as I would be certain that I could get this part and it seems your watchmaker is not used to this sort of thing.
Cheers, Chris
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