SN 558396. 

Lens is in mint condition. It shows light, if any wear on exterior. Filter rim looks good and it accepts filters. Front Glass does not have any visible scratches. I don't see any fungus or haze inside the glass. No dust specs inside. Glass looks very nice over all.  

Performance:

Lens has no known issues. Focus works good. Aperture blades open and close properly. Lens looks and works good.