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OSBM Bolt 
OSBM Bolt on concrete block, S side of road.
Location
Grid reference: SN 2507 1686.
Landranger 158: Tenby & Pembroke.
Structure: Concrete block.
Waypoint: OS0579.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Carmarthen,
19.59km to the east.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Carmarthen to Haverfordwest levelling line. The surveyor's description was OSBM Bolt on concrete block, S side of road.
Location
Grid reference: SN 2507 1686.
Landranger 158: Tenby & Pembroke.
Structure: Concrete block.
Waypoint: OS0579.
Neighbouring Flush Brackets
| G3222 | Pont-y-Fenni 1.54km to the west. |
| G3221 | Pwll-trap 1.65km to the east. |
| S0622 | Llanddowror, Church 2.35km to the south. |
| S7950 | St Clears, Old Market Hall 3.06km to the east. |
| G3223 | Nant House 3.18km to the west. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Carmarthen to Haverfordwest levelling line. The surveyor's description was OSBM Bolt on concrete block, S side of road.
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