Grandmother's Rocking Chair

I inherited this rocking chair from my grandmother who lived in the mainline Philly area. She had an extensive antique furniture collection that was mostly super high-end Chippendale, so this rocking chair didn't seem to fit with the rest of the house/collection. I would love to learn more about it. It's about 31" tall and the seat is 15" at it highest point. The seat is about 16" x 20". There are no stamps or markings on it. The spindles appear to be hand hewn where they taper into the top piece.