For your consideration is my el-Nikkor 50/4 enlarging lens.
The exterior cosmetics of this lens are excellent, no scratches or anything like it. Rated 9/10.
Aperture blades look clean and in good shape.
Front and rear elements both look clean and in good shape. Possibly a few specks of dust on the outside of the elements.
Asking price: $20 shipped in CONUS