The true competitors of the PP 5070, are, mechanically speaking, the VC Chronos.
They share the same base, they don't have flybacks.
So, yes, the 1815 doesn't not have a Date, but its movement is almost identical to the Dato, and can't be considered a a true competitor.
Therefore, the VC and the PP used outsourced momvements, while Lange uses an inhouse movement, made and dedicated for their Chronos.
That's not really the same league, and that is a fact.
Best,
Nicolas
This message has been edited by amanico on 2010-04-20 12:32:42