This is a 19th century kepi in blue wool, which was likely worn by a member of the U.S. Army. This could possibly be associated with Custer's 7th Cavalry; however these were also used during the Indian War which was Post Civil War. Without provenance, or history of prior ownership, which time frame this is from cannot be definitively stated. This assessment does not stand as an authentication of such. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.