Nikon TC-17E II brand_Yamato There is a large chip

There is a large chip to the front element in the middle

except for- and I am going to take a few breaths to try to calm down before I continue this description- an ID number engraved on the side of the viewfinder

diaphragm is good

and quick start guide

and you need a transmitter for this receiver to do anything

Nikon TC-17E II brand_Yamato There is a large chipThe Nikon TC 17E II is an autofocus teleconverter designed for select Nikon AF S telephoto lenses (here's Nikon's compatibility list). Provides a 1. 7x focal length boost, loses about a stop and a half of light. In excellent condition, with clean optics. Includes caps.