That sounds like something worth being careful with before trying to identify it.
From your description—heavy metal base + sharp spikes + rusted—a few possibilities come to mind:
- Old defensive or security device (like anti-climb spikes or a barrier piece)
- Industrial or agricultural equipment part (could be from a machine that grips, tears, or aerates soil)
- Decorative ironwork (some vintage fence finials or ornamental bases look surprisingly dangerous)
- Animal deterrent or trap component (especially if the spikes are prominent and purposeful)
But honestly, those details could fit a lot of things. The exact shape and layout of the spikes matter a lot.
Before handling it further:
- Wear thick gloves (rust + sharp metal = infection risk)
- Avoid brushing against it—rusty spikes can easily puncture skin
- If it’s very corroded, it could break unpredictably
Best next step
Could you share a photo of it?
Even a quick snapshot will make it much easier to identify accurately.