The serial number 260252 suggests that it is an AI’d version K (according to the list of Roland Vink).
The exterior, as shown in the photos, is "well used". Focusing requires some effort, though nothing problematic as this is a true landscape lens you use on tripod . A bit of dust inside, optically nothing wrong.
Here some references to photos I took with this lens:
https://www.flickr.com/photos/139089658@N08/albums/72177720306505545/with/31285132174/(object is sold without the tripod and without arca-swiss-plate, see the last picture). Asking price : 400€
If interested, just send a PM
