This is an antique, late 19th to early 20th century oak rocking chair. The carved appearance of the crest rail at the top of the back of the chair was a 'new' technology in that era, referred to now as pressed oak. The carved style design was steam pressed into the surface. The legs are turned. It does appear that the egg cup form back splat may have been replaced at some time. There are quite a number of these on the market and antique chairs, especially rocking chairs are slumped on the market currently. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.