Black Nikon F Photomic FTn metered prism. The meter works (a minor miracle) and the battery compartment is clean with no corrosion. It reads dead on outside and a stop off inside in dim light. However we do not have the original 1.5V PX-13 batteries. We are using the more common 1.3V 625 batteries so that may be the difference. Either way it's well withing the tolerance of modern film. 

Mounted on the camera the viewfinder prism is bright and clear with no silvering. The viewing window looks good and the plastic trim around it is un-cracked. The cover shows minor, and rather attractive, brassing on the corners as well as light cosmetic handling wear. 

This meter works now, at this moment, it is an old meter and these are notorious for not working. If you are using this meter you should plan on having a backup to double check your readings from time to time. Please do not have unreasonable expectations.