Stereo Realist Glass Slide Stereoview 3D Building St. Louis Arch Missouri 1960s

Hello all! Posting my next lot of slides. I took a little break from posting for the holidays, but I hope to get back at it!
This is a hand-mounted stereo slide (made with metal and glass). The subject matter is the construction of the St. Louis Arch. The left image has a greenish tint on the edge, see pictures.
Location: St. Louis Missouri
Date: 1960s Photographer: Erwin F. Schmidt
Clean, no chips, no cracks. Looks great through the viewer! Meant to be viewed with a Stereo Realist 3D Viewer.
I always combine shipping if you purchase more than one slide.
Let me know if you have any further questions!