The Rockford Chair and Furniture Company was founded in Rockford Illinois in 1882. by Pehr August Peterson, Alexander Johnson, and August Peterson. In September of 1928, a tornado destroyed Factory B, while Plant A remained in operation until 1950. Many of their products feature a Jacobian Revival design which can be identified by ornate machine scrolling and decorative elements. Look up Jacobian Revival furniture to see if your buffet falls into that category. The style was popular from the 1870s until the early 1930s.
Rockford furniture is all over the internet sales and auction sites. Check them out and look for something similar to your own. Retail prices range from $350.00 - $550.00. Best values are in pieces that are in the best condition.