Thanks! I should have clarified in the first post pic 2 & 3 are the same socket with the flash on & off, and the last photo I took a few days ago when I first brought them home that's why the MTF is in the photo.
To me they look like the 1927 & 28 stampings but I want a second opinion. I also have the 3/4 extension but haven't found the stampings since it's beaten up. I got these along with the electrical tester in my last thread post.