AI Appraisal Estimate

This is a vintage precision measuring instrument, specifically a No. 176 pocket gage, likely manufactured by L.S. Starrett Co. or a similar high-end toolmaker of the mid-20th century. Constructed from polished tempered steel with a chrome or nickel finish, the tool features a unique fan-shaped pivoting mechanism. One side of the gauge includes a taper leaf (0 to 1/2 inch) for measuring the width of slots and holes, while the other side features a calibrated scale for thickness measurements in thousandths of an inch. The metal surfaces remain bright with well-defined, etched numerical markings and graduation lines. Notable features include the central pivot point with a decorative concentric ring design and the sharp, pointed taper leaf. The condition is described as 'like new,' and visually it appears to be in excellent functional order with minimal surface oxidation or scratching and no visible deformation to the precision edges. The accompanying leather case, seen in the background, is a protective sheath with a metal snap fastener, typical of professional tools from the 1940s to 1960s. The craftsmanship is indicative of high-quality industrial tooling, prioritizing accuracy and durability in a compact, portable form factor.

I have carefully reviewed the visual evidence and specifications for the L.S. Starrett Co. No. 176 Pocket Gage. Based on the provided physical description and imagery, I assess this item to be in 'Near Mint' to 'New Old Stock' (NOS) condition. The etched graduations retain high contrast, and the polished steel surfaces show no signs of the pitting or 'peppering' common in tools of this era, which is remarkable for a precision instrument dating roughly from the 1950s. The market for vintage Starrett tools remains strong among both tool collectors and 'machinist-users' who prefer the metallurgy of mid-century American steel. The No. 176 is a specialized item combining a taper gauge and a thickness leaf; while not as common as standard micrometers, it maintains a steady niche demand. The inclusion of the original leather case with a functional snap significantly bolsters the value, as these accessories were often lost or damaged over decades of shop use. While the tool appears authentic based on the characteristic Starrett pivot design and typeface, a definitive verification is limited by the digital format. For full authentication, I would require an in-person inspection to verify the tactile smoothness of the pivot action and a microscopic examination of the manufacturer’s mark to ensure it is not a later reproduction. Value is driven by the 'like new' state; any microscopic rust discovered in the hinge or slight bending of the distal end of the taper leaf would reduce the valuation by 30-40%. No scientific testing is required beyond a physical calibration check against a known standard.