Cast iron tether weight or anchor ball with threaded eye bolt

This object is a heavy, spherical cast iron implement, commonly utilized as a tether weight, mooring anchor, or industrial counterweight. The piece features a dark, heavily oxidized finish displaying characteristic surface pitting, rust patination, and minor abrasions consistent with age and outdoor use. A prominent threaded eyebolt featuring a distinct dumbbell or crossbar top protrudes from the top hemisphere, secured into a threaded aperture. A smooth, cylindrical hole pierces the lower portion of the sphere, which may serve as an additional attachment point or a remnant of the casting process. The construction displays rugged industrial craftsmanship typical of nineteenth or early twentieth-century hardware, though no maker's marks or stamps are visible on the weathered surface. The identification rests purely upon visual observation of its shape and material properties, remaining unverified regarding its precise era of manufacture or exact historical application.

Based on what I can see in the photograph, this object is a heavy, spherical cast iron implement presenting features consistent with a nineteenth or early twentieth-century industrial tether weight or mooring anchor, complete with a threaded eyebolt and lower aperture. However, I cannot verify the exact era of manufacture, precise historical application, or metallurgy from a photo alone, and physical inspection would be needed to confirm these details. The estimated value range of $150 to $300 assumes that this hypothetical industrial attribution is correct. This valuation accounts for the heavy oxidation, surface pitting, and rust patination, which reflect age and outdoor use but also dictate a rustic aesthetic. General market demand for vintage industrial hardware and salvage decor remains steady among interior designers and collectors of industrial artifacts. This value depends entirely on the assumption that the item is a period-authentic industrial piece; if physical inspection reveals the item to be a modern reproduction, replica, decorative copy, or made 'in the style of' vintage hardware, the value would likely decrease significantly to the $40-$80 range. To establish a more precise valuation and address the condition, an in-person examination by an industrial antiques specialist, coupled with metallurgical testing or provenance documentation, would be necessary.