Two-jaw gear puller bearing a Proto brand mark

This metal mechanical tool appears to be a reversible two-jaw gear or pulley puller. It consists of a central heavy-duty cross-bar, a threaded pressure screw with a hexagonal head for wrench application, and two adjustable hooked arms (jaws). The arms are held in place with spring-style clips on the cross-bar. The tool is primary silver-toned, likely made of drop-forged steel or a similar alloy, and exhibits signs of heavy industrial use. Visible oxidation (surface rust), grease, and general wear and tear are present across the body and threads. The cross-bar features raised cast lettering. One side bears a mark reading 'PROTO', while the opposite side is marked 'MADE IN USA' and '4021', which is consistent with the model numbering used by the Proto tool company for their puller series. The craftsmanship suggests a mid-to-late 20th-century design intended for automotive or industrial repair. While the markings are consistent with manufacture by Proto, the item's provenance and age remain unverified without physical testing and inspection for potential part replacements or historical reproduction markers.

Based on the provided image, I have examined this two-jaw gear puller which bears markings consistent with the Proto brand and model '4021' made in the USA. While I can observe the raised lettering and general construction, I cannot verify the item's metallurgical composition or provenance from a photograph alone. The presence of surface oxidation, grease, and significant wear suggests the tool has seen heavy use, which typically affects the resale value of industrial equipment. My valuation is based on the working hypothesis that this is a mid-to-late 20th-century Proto tool. In the current secondary market for vintage hand tools, items of this specific design and manufacturer are often sought after for their durability and reputation for quality. However, the value is highly dependent on the functional integrity of the screw threads and the lack of structural cracks, which cannot be confirmed without a physical inspection and testing under load. If this item were found to be a modern reproduction or a lesser-branded 'in the style of' tool, the value would likely drop to the $15-$25 range. To establish a more precise value, an in- person examination by a tool specialist would be necessary to verify the age of the casting and ensure no parts have been replaced with non-OEM components. Given the utility and brand association, the estimated range reflects typical market behavior for well-used but functional professional-grade pullers of this era, assuming the attribution to Proto holds true upon professional authentication.