One of my relatives has this metal component sitting in their backyard. It was a souvenir that my grandfather got to keep from his days working in the aerospace industry (primarily for Boeing). My grandfather has passed on now, but if I recall correctly, when I was a kid he told me that this part was from a prototype space capsule:
I don't know how old this part is, but it's been sitting outside for at least 30 years and I would guess it's at least a few decades older than that. Other than dust, the part has no wear or corrosion despite its decades of exposure to the elements. I think the tank underneath came with it but I'm not certain about that.
It bears a strong resemblance to the hatch area of an Apollo capsule, but the Apollo capsules I've seen all have slanted windows on both sides of the hatch:
Is this souvenir indeed a space capsule component? Is it possible to identify which series of capsule it was from?