Yep, the NCG 1675 is real, uncommon but real. Two main variants: the Dauphine hand and Concorde hand versions. Here is a Douphine hand from Antiquorum. http://catalog.antiquorum.com/catalog.html?action=load&lotid=370&auctionid=221
I think all of the 1675 NCGs had 1570 movements.
I have to restate, this is really a 1675, and NOT a 6542. They look similar.
Do a google search and there are all kinds of references on this beautiful piece.