So I had a big conundrum a few weeks back in trying to figure out what lens to match to my IIIg. I'm still torn between the Elmar f3.5 and Summitar f2, but I decided this is a bit too big to justify its max 2.8 aperture. Mechanically it's pristine-aperture clicks are smart, collapses firmly and locks well, focus is smooth and easy. Rear glass is perfect, front glass has three light scratches and a few more faint pits along with some specs of dust. Nothing out of the ordinary for a lens of this age and hasn't and shouldn't affect picture quality. Serial number 1620xxx. Asking $400 net to me, I'll cover shipping. I'll post pictures when I get a chance tomorrow.