This is a Crowned Baler Shell (Melo aethiopus) from the Philippines. The shell is a tan colored off white with several brown stripes on it. The real star of the show is the top section of it. The shell has a perfect Fibonacci spiral with pointed sections along that spiral, giving it a "crown" like appearance, which is how it got its name.
This piece measures approximately 18.5cm x 12.9cm x 8.8cm