Ignore the pen at the top of the picture, it was an easy one to figure out.
The quill at the bottom has a number 2 nib, double bands top and bottom, and the extension at the opposite end as the nib screws in and out.
For a basic test, I dipped it, but did not flex too hard because the nib is untuned and is a bit toothy yet.
Unsurprisingly, the sac is toast, it is very hard. The body (the length between the section and the screw in extension) is 3 and 5/16th long. The length
from nib tip to tapered end is 8 inches long. The base is gold veined black marble with green felt underneath with the Waterman label.