....i never meant to suggest for a second that the 5070 had been in production for 40 years. What i said was that it was the first manual wind watch for 40 years.....
The Ref. 1463 stopped production in the 1960s. There was then no manual wind simple chrono production until the 5070, in 1998. Hence, for almost 40 years Patek Philippe never produced a manual wind chrono.
I hope that i am now clearer