Tis a PRESTOLITE for sure,
Just did a search online and found a copy of a catalog page with it on it..74.50, it cost! I recognize the page as being out of a JAMMER Handbook..
The big lump was black.. looks like the one they used when they supplied HD.. back around 77ish... I can remeber selling lots of points replacement kits, for those who did not want to be stranded on the road. Keep in mind when I started riding, there was only 2 or 3 HD dealers in the whole province of BC, by 77 there were a few more..