Do an internet search for "Winchester M70, Portugal". You will find information that in 2013 Winchester has shifted assembly of M70s to Portugal. FN, the parent company of Winchester, is after all, a European company. This apparently appeared on Winchester's Facebook page some time ago. FN is obviously not broadcasting this since one of its former marketing advantages was that M70s were "American-made". FN's primary bread-and-butter line is military weapons; civilian firearms are a secondary line.
The transition is causing a temporary shortage of new M70s. I expect that the price for the new Portugese M70s will shoot up the way that the price for the Japanese Winchester .30-.30s went up.