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| origin unknown |
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| 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, Late 15th century ? (Oxford, MHS) |
| Quadrant, Unsigned, origin unknown, Date; place Undated (London, BM) |
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