Let me expand just a bit on Zerk's comment. This Norwalk is an old friend, ever since I researched it quite sometime ago for another (now defunct) on-line auto quiz. As Zerk said, this is the only known Norwalk in existence, and currently resides in Martinsburg, West Virginia, where it was built. The name originates from Norwalk, Ohio, where the manufacturer was located (1910) before moving to Martinsburg. Googling "Norwalk Underslung" will yield lots more technical, and historical, information on this particular car.
The better known American Underslung was conceived much earlier (1905) by the famous Harry Stutz, and Fred Tone, and was manufactured in Indianapolis, Indiana.