I have a Simco saddle that is similar to yours, I got it brand new in the late 90s, so I'd guess yours would be from the 90s or early 2000s too, deff. not a 60s or 70s style saddle. You can tell by the swells on the pommel. Your saddle and mine probably have the same tree. I know mine has a Ralide tree, yours probably does too.
Simco still produces the same saddle that I have, and new it sells online for between $600-$800. I was really young when I got mine and it was quite a while ago, but I remember it being only like $350; big price difference.
I would ask $200 for your saddle. It still looks like it is in nice shape, and it is nicely broken in. It's not fancy. I would advertise it as a trail saddle. You'll probably have an easier time selling come spring or summer.
You said it was used a camp for a while? If it doesn't sell by like fall time, couldn't you donate it to the camp and use it as a tax write off, like as a charitable donation?