There's not much information around on the Delta brand models but according to the Blue Book of Guitars  this brand was used on electric guitars made in the USA from imported parts around 2003 to 2006 by Musician's Wholesale America of Nashville, Tennesse. They have "Delta, Nashville Tennesse" on the headstocks and sold for around $900. I can't find any website for Musician's Wholesale America. They had a Les Paul type electric as well as a hollow bodied Jazz guitar.

Source; My Les Paul - Delta thread