The ones without the "Swiss Made" were made prior to 2009. They should also be stamped with the Geneva Seal on the movement, as appose to the double P. Reason for that is because at the time Patek used to send their watches out to get tested through a 3rd party company. They stopped that in 2009. Patek started to test their own watches and would stamp their PP seals on the movement, and of course, adding "Swiss made" onto their dials. I did see however some really rare 5167 watches that did not have Swiss made on the dial but had Patek seals on the movement.. I would assume it was serviced by Patek with a Geneva Seal and after servicing was they probably swapped out to put their seal on it. Anyway, if you want to see a 5167 without the Swiss made just time 5167 Geneva Seal! Hope this helped!