[Late 60s or early 70s K Horns NOT for sale]

I have decided not to sell my Khorns.  Hope this post will help  so I won't be bothering anyone anymore.  If there is a way to delete this post please let me know.  I do like this site and want to remain to gain more knowledge  

[Late 60s or early 70s K Horns NOT for sale]

I have owned these since the early 70s.  I bought them from the original owner, who was a good friend.  I think I remember him saying he even drove to Hope about 300 miles south of where I live.  They have been in my houses and in use the entire time.  Am thinking about selling them, but have no idea what they may be worth or even how to sell something that large and heavy.  Looking for any helpful ideas.  Maybe someone with more knowledge  can tell something from the serial number.