- Medford, Oregon, United States
- May 24th
THIS IS AN UNUSUAL ANTIQUE BRASS MACHINIST BOLT CALIBRATION SET. THE SET CONSISTS OF 7 SOLID BRASS PIECES IN A SOLID MAHOGANY BASE. THE LARGEST PIECE (BOLT) IS MARKED PAT'D JULY 6TH 1897 THE SMALLER PIECES ARE MARKED: 8 / 64, 10 / 64, 12 / 64, 14 / 64, 18 / 64 AND 20 / 64 THE LARGEST BOLT IS 1 7/8 INCHES IN DIAMETER - THE SMALLER 7/8 INCHES.