Telescoping precision bore measuring gauge set

This is a set of six telescoping bore gauges designed for precision internal measurement, housed in a flexible blue vinyl or plastic roll-up pouch. The tools are constructed from steel with a satin or matte finish on the main handles and polished surfaces on the expanding telescopic plungers. Each tool is T-shaped, consisting of a knurled handle that locks a spring-loaded plunger. The pouch contains labeled slots for sizes A through F with corresponding millimeter and inch ranges printed in white text. Specifically, the markings read: 'B: 12.7 to 19mm (1/2" to 3/4")', 'E: 54 to 90mm (2 1/8" to 3 1/2")', 'C: 19 to 32mm (3/4" to 1 1/4")', 'F: 90 to 150mm (3 1/2" to 6")', 'A: 8 to 12.7mm (5/16" to 1/2")', and 'D: 32 to 54mm (1 1/4" to 2 1/8")'. The tools appear to be in functional condition with some minor surface scuffs and spotting on the pouch, consistent with use in a workshop or machine shop environment. No specific brand name is clearly visible in the image, although the construction is stylistically consistent with common industrial tool manufacturers such as Mitutoyo or generic professional-grade equivalents. The design reflects late 20th-century to contemporary manufacturing standards for machinist tools.

Based on my visual examination of the provided images, I am looking at a set of six telescoping bore gauges within a labeled vinyl roll-up pouch. The set appears to cover a standard measurement range from 5/16 inch to 6 inches across its six components. Based on what I can see, the tools exhibit the construction and finish typical of machinist tools from the late 20th century to the present. The value of this set is heavily contingent on its manufacturer, which I cannot verify from a photo as no logo or brand name is clearly visible. For the purpose of this appraisal, I am hypothesizing that these are professional-grade tools. If the set is by a premium maker such as Mitutoyo or Starrett, the value resides in the upper range of $120-$150. However, most contemporary generic or unbranded sets of this style typically sell in the $40-$60 range. The current condition shows minor surface scuffs and spotting on the pouch, which is standard for used shop tools. I cannot confirm the mechanical accuracy or the presence of hidden corrosion within the plunger mechanisms without a physical inspection. Generally, the market for precision measurement tools remains consistent, driven by demand from trade professionals and hobbyists. To confirm a specific attribution, I would need to find a maker's stamp on the handles or examine the original packaging. If this set were determined to be an unbranded imported copy rather than a name-brand industrial tool, the value would likely stay at the lower end of the estimate. A physical calibration test would also be necessary to ensure the tools meet laboratory tolerances, which significantly impacts their utility and market value.