TWSBI 580 ALR fountain Pen Nib.
This image was taken using a reverse ring, 50mm Pentax SMC, and a small length of extension rings. Natural lighting, no flash.
Many fountain pen manufactures take pride in engraving their logo on their nibs. TWSBI is one of the more budget friendly brands that do this that I know of.
The nature of the ink droplets on the nib and sometimes filling in the engraving provide an interesting subject.