New old stock stainless steel miniature model or sculpture of the St. Louis Arch on walnut base. These models are based on the St. Louis Gateway Arch designed by Eero Saarinen that was completed in 1965.The Gateway Arch is a 630-foot monument in St. Louis, Missouri, United States. Clad in stainless steel and built in the form of a weighted catenary arch, it is the world's tallest arch, the tallest man-made monument in the Western Hemisphere, and Missouri's tallest accessible building.