This piece is indeed a mix of styles, the form of the desk based on Spanish Revival Vargueno desks, originally a form of a portable desk, resembling the top half of a fall front desk. It is basically a chest or box with the front panel folding down for writing, which sits typically on a trestle form base. Revival style pieces tend to date from the first quarter of the 20th Century, the most popular being Colonial, Federal and Spanish Revival.
Generally these desks tend to be constructed of maple with a mahogany or walnut finish, some times a mix of maple with walnut veneers. We can't tell for sure from the images which wood this one is, but it appears to be walnut. Currently at auction one like this could sell in the $500.00- $700.00 range at auction.