This pen has two odd things about it. The first is that it's a safety pen.
Safety pens were designed to prevent leaks and improve the cap seal. To close them, you turn a knob at the end of the barrel and the nib retracts into the reservoir. When the cap is screwed down over the opening it creates a good seal between the cap and section.
Safety pens were invented in the 1890s. In the US they were superseded by self fillers by 1920; in Europe they persisted a few decades longer. But they were never widespread.
The other odd thing: the nib is glass.
Glass nibs were an attempt to make a corrosion resistant nib without expensive gold. They were also more common in Europe than the US.
This little guy writes very dry, but that may just be the ink. I'm tempted to experiment with it: without a feed to clog it should do fine with drawing inks and India inks.
There's no maker or brand anywhere on the pen. But it seems nicely made and the overlay is in great shape. I feel lucky to have this little oddity in my collection.