All of the frames and slides are rough forged in Brazil. Some of the real early springfeilds had frames made in Germany (Suhl).
There was a long period that the early springfeilds had no Brazil stamp, but they were still rough forged in Brazil. The current frame/slides are still forged there, some are stamped and some are not.
Most of the stamps were on the right side dust cover, while some of the newer ones are on the bottom of the cover (frame). I have a current gun with a very light mark on the bottom dust cover. I also have a current gun with NO Brazil mark any where and the old NM serial #, versus the current N serial # prefix. Most of the newer guns also had a "dot" matrix serial # instead of a traditional stamp. Both my current guns, the NM and N prefixes are stamped.
What it comes down to is this, most of the finishing/fitting is done here in the states. I hope the newer guns will eventually not have the Brazil stamp, as i think its ugly... just more un necassary writing.
Im sure glad i found one of the NM serial # guns recently, it was fit exceptionally well for a factory gun, had a storm lake s.s. barrel, traditional rear only slide serrations, and had very clean script and emblem on the slide. I sent this gun to Larry Vickers for some work, should get it back next month.