Nikkor 105mm 2.5 AIS, from what I can tell, I am at least the 3rd owner, hence the affordability of it. A bit rough outside, with someones name on the barrel, not the same as the buyer I got it from. Clean front glass, but light scratches all over the back. It was advertised with a large piece of lint/dirt/dust right in the middle right inside the rear element.
I stripped it tonight in less than 5min, its that easy. Someone also had posted great visual instructions of the process. Cleaned the insides of the center and rear elements with a brush, blower, and compressed air for the more stubborn stuff. Inside the barrel was lots of dust as well. Back together lickety split. And all is well as can be.