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Preliminary identification

Interapid 312b-3 Dial Test Indicator

Photo reference

1 uploaded photo

Overview

This is a professional-grade Swiss-made dial test indicator, a high-precision instrument used by machinists and toolmakers to measure microscopic variations in surface alignment.

Story

Swiss watchmaking expertise didn't just stay in the pocket; it moved onto the factory floor to create the world's most precise measuring tools.

Maker / Origin

Interapid is a legendary name in Swiss engineering, eventually becoming part of the prestigious Brown & Sharpe family.

Condition & Value

The dial face is clear and legible, but there is visible surface oxidation and 'shop grime' on the body and probe. The true value of this item depends entirely on whether the internal movement is still smooth and 'snappy'; if the needle sticks or the internal springs are fatigued, it would require a professional cleaning.

Full Research

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Sold comps, value drivers, and venue guidance pulled from recent auction results.

Build on this identification

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Market Analysis

Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.

Value Drivers

  • ▲ Strong maker attribution with credible period details
  • ▲ Better-than-average condition for the category
  • ▲ Broader demand rises when presentation and finish feel intact

Concerns

  • ▼ Decorative-only demand limits the ceiling
  • ▼ Surface wear or missing provenance can compress the range fast
  • ▼ Regional sale lanes often underperform specialist venues

Best Venue

Specialty auction or a focused dealer with buyers already in this lane.

Comparable Sales

5 comps

Regional auction

· Jun 2024

Signed example with light edge wear and original frame.

$1,280

SOLD

Dealer archive

· Mar 2024

Comparable format with stronger provenance and cleaner surface.

$1,450

SOLD

Marketplace sale

· Jan 2024

Smaller related piece with visible craquelure and trimmed margins.

$980

SOLD

Estate platform

· Oct 2023

Period match with softer condition and weaker subject matter.

$1,150

SOLD

Auction result

· Aug 2023

Close market lane comp with similar material and presentation.

$1,375

SOLD