The version you have is called a bitsa. They are very prevalent nowadays.
It is a series IV top plate. (released 1989)
With a series II bottom plate. (Approx 1980 from serial number)
Judging from the condition of the eye viewer & general black areas of body (lack of wear marks) I would guess it is most likely a series IV body which has had the bottom plate replaced for some reason. If it is a series IV check the viewfinder as this is the version where the silver delamination on the prism started to become prevalent.
It is definitely NOT a transition version. Nothing at all about the body ties in to suggest that. Your 2 main components are 2 clear version apart.
Unfortunately nothing special but it looks like a very good user body. My advise is :- Enjoy using it!
Last edited by Tool_Horder; 02-14-2020 at 02:19 PM.