Opus 88 Demonstrator Fountain Pen
It is an eyedropper-style fountain pen, so you would unscrew the front section on the pen, and then with that eyedropper that is included, you would fill the ink into the barrel of the pen, and then reattach it.
"Opus 88" is imprinted on the bottom of the cap.
It is not completely transparent, but a little opaque. It comes with a stainless steel German nib that has "Opus 88" engraved on it. The nib sizes: EF, F, M, B and Stub 1.5mm. With the color options of clear, red, grey, and orange.