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origin unknown
While most instruments, whether signed or not, can be attributed to a particular city or region, some remain difficult to place precisely.

For origin unknown instruments, see:
   Astrolabe, Unsigned, origin unknown, circa 1400 (Oxford, MHS)
   Astrolabe, Unsigned, origin unknown, Early 16th century (Oxford, MHS)
   Astrolabe, Unsigned, origin unknown, Late 14th century ? (Oxford, MHS)
   Equinoctial Dial, Unsigned, origin unknown, 15th century ? (Oxford, MHS)
   Gunner's Sight And Level, Unsigned, origin unknown, 16th century (Firenze, IMSS)
   Horizontal Dial, Unsigned, origin unknown, circa 1500 ? (Oxford, MHS)
   Measuring Rod, Unsigned, origin unknown, 15th century (London, BM)
   Navicula Dial, Unsigned, origin unknown, 15th century ? (Oxford, MHS)
   Polyhedral Dial, Unsigned, origin unknown, Date unknown (Oxford, MHS)
   Quadrant, Unsigned, origin unknown, Date; place Undated (London, BM)
   Quadrant, Unsigned, origin unknown, Late 15th century ? (Oxford, MHS)

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