Thanks for posting! Here are my two cents bc it is January, I did my stall cleaning and chicken tending chores already this morning, used the snow blower this weekend and will need to use it starting Friday for a whole week. MEANING, stuck inside at the computer at DH's office.
I would NEVER buy an antique saddle on Ebay or any place else online! If the tree (skeleton) is shot, then this is a barn ornament and nothing else. If it had a solid tree, this single fork side-saddle would need to be stripped and remade. I do know an Amish shop less than an hour away that does such things...as long as you are in no hurry to get it back!
My preference would be for a double fork SS bc you have to use your legs to grip the saddle to stay on and the secondary fork enables you to do so. You press the outside of your right leg against the lower fork and you keep your body twisted as you sit back in the saddle. It is a workout.
https://springwillowequestrian.blogspot.com/p/blog-page.html
You HAVE to have the correctly rigged girth and I would prefer BOTH a breast strap and crupper to secure this saddle to my horse. If I ever get around to buying one I do have a very safe mare to ride SS, and you HAVE to have a safe mount bc you cannot balance as you could astride should your horse shy, rear, bolt or buck. I have been on horses that have done all of these things before. If you lose your one stirrup SS you are off and I have not seen a SS with a breakaway stirrup leather, so you could be dragged.
One more thing. My mare is a Mountain Horse, gaited and VERY smooth to ride. She can't jump worth a pile of silver dollars. Horses not built to jump well have NO SCOPE, and many scopey horses aren't trained to be babysitters. I think jumping astride is an exercise in balance and faith.
Yeah...I have thought a LOT about SS's.