Vintage screw plate tap and die set in wooden case

A comprehensive vintage mechanical tool set housed in a dark, weathered wooden case. The set includes various circular dies, long-handled tap wrenches, and a series of screw taps. A partially damaged yellow paper label on the interior lid bears the mark 'No. 505 General Purpose Screw Plate' and attributed to the 'Greenfield Tap and Die Corporation' of 'Greenfield, Mass. Made in U.S.A.' The user identifies this as item number 505, which is consistent with the visible label; however, this claim remains unverified without physical authentication. The tools are constructed of darkened steel with visible surface oxidization, heavy patina, and signs of significant industrial use. The set appears stylistically consistent with early-to-mid 20th-century tool manufacturing. The wooden box shows substantial wear, including staining, splintering, and missing sections of the original finish. Both the tools and the storage tray demonstrate craftsmanship typical of historical American mechanical engineering, though completeness of the set cannot be confirmed from the image alone.

Based on my examination of the provided images, this lot consists of a vintage screw plate tap and die set housed in a weathered wooden case. Per the user's submission, this set is identified as a 'No. 505 General Purpose Screw Plate' attributed to the Greenfield Tap and Die Corporation. From what I can see, the interior lid bears a label that appears consistent with Greenfield’s historical branding; however, I cannot verify the authenticity of this mark from a photo alone. Physical inspection would be required to confirm that the tools are not later replacements or marriages from different sets. The condition shows heavy surface oxidization, patina, and wear to the case. This suggests a history of industrial use, which is typical for such items but detracts from the value compared to a 'New Old Stock' set. The estimate of $100 - $225 assumes the attribution to the Greenfield Tap and Die Corporation is correct and that the set is largely complete, as Greenfield remains a respected name among tool collectors. If the set is found to be missing critical components or if the tools are determined to be unbranded generic replacements 'in the style of' the original manufacturer, the value would likely drop to the $40 - $75 range for utilitarian or decorative use. Market demand for early-to-mid 20th-century American mechanical tools remains steady but is highly dependent on completeness and the integrity of the original wooden housing. To confirm the value, an in-person examination by a specialist in antique machinery is recommended to check for cracked dies or stripped threads that are not visible in the photographs.