This is a **vintage Etalon outside micrometer** (likely from the P. Roch era, now associated with TESA), made in Switzerland, with a 5–6 inch (127–152 mm) measuring range. It appears in excellent condition, complete with its original wooden case and standards (setting rods), which adds to its appeal for collectors and machinists.
Etalon micrometers are highly regarded for their Swiss precision and smooth operation, often comparable to or preferred over brands like Mitutoyo or Starrett in vintage tools.
**Resale value** on platforms like eBay for similar vintage Etalon outside micrometers in good-to-excellent condition (with box) typically falls in these ranges:
- Smaller sizes (0-1" or 1-2"): $80–$150
- Mid sizes (2-3" or 3-4"): $120–$200
- Larger sizes like 5-6": Less common, but generally $150–$300+
Larger-frame micrometers like this one are rarer on the used market, and the included wooden case boosts value. Comparable high-end vintage Swiss tools in similar condition (e.g., TESA/Etalon or Brown & Sharpe equivalents) often sell for $200–$350.
Given the clean appearance, original box, and rarity of this exact size, a realistic resale value as of late 2025 would be **$200–$300 USD** on eBay or similar sites, potentially higher ($300+) if listed to collectors or if it includes calibration standards and proves very accurate/smooth.
If it's in fully functional, like-new condition, you could aim for the higher end. Prices fluctuate based on demand, but Swiss vintage precision tools hold value well.