Cordoba 23S Solid Ovangkol Top Soprano Ukulele.C _rdoba 23S Solid Ovangkol Top Soprano Ukulele. The 23 Series is Cordoba s newest line of ukuleles featuring exotic woods. The 23S is a soprano ukulele featuring a solid ovangkol top paired with ovangkol back and sides, Composite bridge and fingerboard, mahogany neck, and ovangkol headstock veneer. Ovangkol ranges from rich orange to a darker brown in color, and is commonly streaked with gray, purple, or black. It s tonally similar to Composite, with a slightly fuller mid-range.