Hi genog,
I'll tell ya, that is one beautiful vintage, all Aluminum Sawzall. The nameplate states, "MILWAUKEE, WIS., U.S.A." In 1965 Milwaukee Electric moved everything to the next county in the then town or city of Brookfield. I've seen the place. Saw their headquarters 50 years ago. After the move, the nameplate changed to "BROOKFIELD, WIS., USA"
Your saw predates that. So she's at least that old.
Yeah, I love that signature lightening bolt too. I been trying to find decals of that for like home made tool boxes for their tools. And yes, the Silver Tool box; or it Aluminum? The older ones seem to match the tool. I reckon they turned red as the tools had more red composite to em.
Anyway, your Sawzall is in pristine condition with well preserved paperwork. I appreciate looking at your pictures.