Nearly all middle-joint pens are A. A. Waterman or Sterling products. Likely this pen was made under license, as it appears to predate the expiry of the 1899 middle-joint patent.
The other unusual Edward Todd is also missing a few parts -- the feed and the cap -- but what a nib! It's a fully marked "J" nib, with the "J" stamped in relief just as done with steel "J" dip pen nibs. Very hard to find in gold fountain pen form, and for some reason more often seen on German pens such as early Montblancs.