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OSBM Bolt 
Parapet of bridge, 20' NE of centre of stream.
Location
Grid reference: SS 0157 9775.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0919.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1969),
18.63km to the north.
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 Parapet of bridge, 20' NE of centre of stream.
Location
Grid reference: SS 0157 9775.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0919.
Neighbouring Flush Brackets
| G5110 | East Trewent 756.64m to the southwest. |
| G5111 | Little Portclew Farm 1.12km to the northeast. |
| G5112 | Hodgeston 2.17km to the northeast. |
| S0603 | Lamphey, Church 2.72km to the north. |
| G5109 | Stackpole 3.38km to the southwest. |
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 Parapet of bridge, 20' NE of centre of stream.
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