J.B. van Sciver Co. - Chair (4) - Wood - Windsor Chair

These chairs are characterized by their curved backs, spindle rails, and often turned legs. The specific form is often referred to as a "Hoop Back" or "Stick Back".
Windsor chairs were developed in the early 18th century in England, with similar styles remaining popular through the 19th and early 20th centuries (for example around 1920 or 1960).

4 pieces presumably from the American manufacturer J.B. Van Sciver Co.