Clean, tested and working.  Takes 4x AA batteries.

This flash provides TTL and other automation features with select Nikon film cameras.  The manual (not included here) specifically mentions the following.  It could work with later models, as well, but research would be needed:

( US  /  Rest of the world)

N90  /  F90

N70  /  F70

F4  /  F4

N8008  /  F801

N6006  /  F601

N2020  /  F501

N50  /  F50D  

Has setting for TTL, full power manual and 1/16 power manual.  Also works with any camera as a standard hot-shoe mount flash. 

Thanks for looking.