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OSBM Bolt 
OSBM Bolt on concrete block 63' NE of wall junction, 107' SE of gatepost, E side of road.
Location
Grid reference: SM 8837 0025.
Structure: Concrete block.
Waypoint: OS0916.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1969),
17.60km 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 concrete block 63' NE of wall junction, 107' SE of gatepost, E side of road.
Location
Grid reference: SM 8837 0025.
Structure: Concrete block.
Waypoint: OS0916.
Neighbouring Flush Brackets
| G5103 | Kilpaison Burrows 1.15km to the northeast. |
| G5105 | Gupton Farm 1.66km to the southeast. |
| G5102 | Newton Farm 2.18km to the east. |
| G5101 | Rhoscrowther 2.78km to the northeast. |
| G5104 | Castlemartin, Chapel Farm 2.88km to the southeast. |
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 concrete block 63' NE of wall junction, 107' SE of gatepost, E side of road.
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