It's automotive, though not a MB item: On display are two gold-plated Starrett #79 calipers. (From that you might be able to guess where I work.) It's sort of neat to see them sitting right there. Wish I could take one of them home. Just for a week or so.
Excuse my ignorance. First I thought that you were talking about BRAKE CALIPERS. So, I went to Google and got a more realistic description of the gold-plated calipers. Am I warm?
contractorstools.com/starrett_calipers_73.html
"No. 73, 79, 83 Series "Yankee" Spring-Type Calipers and Dividers with flat legs and quick-spring or solid nut
Nos. 73, 79, 83 Series
4, 6, 8, 12" (100, 150, 200, 300 mm)
Starrett "Yankee" Calipers and Dividers are made from a high-grade steel and well finished. The legs are made of flat stock and are very durable. The fulcrum stud is hardened and has a smooth bearing surface. The bow spring, although flexible, is exceedingly strong to assure reliability.
All sizes are available with either spring nut or solid nut. The Starrett quick-adjusting automatic-closing spring nut is designed for making fast, positive adjustments. The threads of the nut firmly engage the screw at the slightest pressure from the leg. When the pressure is withdrawn, the nut automatically releases itself, sliding freely over the screw. This feature saves time in opening and closing."
There are some pics that illustrate what the calipers look like.
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