Mid-Century Parlor Set

My husband and I picked up this parlor set at an estate sale and were trying to figure out its value. The original owner's grandson told us it is circa 1880, and was re-upholstered in 1970.  Then he have us bags of the original horesehair upholstery "in case we wanted it." We purchased seven pieces - settee, captains chair, slider, and four sitting chairs.  They are in excellent condition. Any thoughts?  We appreciate all of your comments!