Looks to be from just before the turn of the century e.g. 1875.
Please look closely at the pics - several wooden tabs are missing/broken, several have chips at the ends, and several has scuff marks... the pictures accurately tell the story.
I'd love to hear how you'll use these; someone was throwing the whole chair away, so I salvaged what I could... plenty of time went into the carvings back when...that I hope their of use to someone new.