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OSBM Bolt 
OSBM Bolt on concrete block, 16' S of hedge junction, W side of road [3GL].
Location
Grid reference: SM 9554 2778.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Concrete block.
Waypoint: OS0594.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1953),
11.94km to the south.
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 Cardigan levelling line. The surveyor's description was OSBM Bolt on concrete block, 16' S of hedge junction, W side of road.
Location
Grid reference: SM 9554 2778.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Concrete block.
Waypoint: OS0594.
Neighbouring Flush Brackets
| S0576 | Wolf's Castle, School 1.17km to the south. |
| S7822 | Wolf's Castle, Railway Bridge 1.52km to the south. |
| S7821 | Letterston, Harp Inn 1.69km to the northwest. |
| S7820 | Ty Goch 2.64km to the northwest. |
| S7823 | Weir Castle 3.16km to the south. |
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 Cardigan levelling line. The surveyor's description was OSBM Bolt on concrete block, 16' S of hedge junction, W side of road.
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