I have a 59" Kub Klipper mower and it cuts as good as my friends 59" woods mower and it cut as good or better then then the IH C3 59" mower.
my model number is K60E
they were originaly made by Sun Master Corporation, Olathe Kansas
Arts Way Company bought them out years and years ago and about 7 years ago Arts Way helped me find some parts and a faxed me a copy of what manuals they had. They no longer service the Kub Klipper Mowers but some of there part numbers are still good becasue they use them on there current mowers. I have found that I can get all my parts for it from other sources, belts, bearings and blades. But Arts Way has that stuff still.
You will just not be able to get mounting brakets and hardware from them.
Here is there web page http://www.artsway-mfg.com/
they were very helpful when I called them. I took some pushing to get them started with helping me even after they told me they could not help with a mower that old but guess what I pushed a little and they did find what I needed.