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OSBM Bolt 
OSBM Bolt on parapet of bridge, 5' SE from N end, NE side of road.
Location
Grid reference: SR 8854 9974.
Structure: Unknown.
Waypoint: OS0917.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1969),
17.97km to the northeast.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Haverfordwest to Carmarthen levelling line. The surveyor's description was OSBM Bolt on parapet of bridge, 5' SE from N end, NE side of road.
Location
Grid reference: SR 8854 9974.
Structure: Unknown.
Waypoint: OS0917.
Neighbouring Flush Brackets
| G5105 | Gupton Farm 1.18km to the southeast. |
| G5103 | Kilpaison Burrows 1.36km to the northeast. |
| G5102 | Newton Farm 2.12km to the east. |
| G5104 | Castlemartin, Chapel Farm 2.48km to the southeast. |
| G5101 | Rhoscrowther 3.04km to the northeast. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Haverfordwest to Carmarthen levelling line. The surveyor's description was OSBM Bolt on parapet of bridge, 5' SE from N end, NE side of road.
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