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OSBM Bolt 
OSBM Bolt on concrete block at production of hedge, 4' NW of hedge junction, E side of road junction [3GL]; OSBM BOLT E SIDE RD JUNC HEDGE JUNC.
Location
Grid reference: SN 4130 1488.
Landranger 159: Swansea & Gower, Carmarthen.
Structure: Concrete block.
Waypoint: OS0771.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Carmarthen,
9.13km 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 Bishopston to Carmarthen levelling line. The surveyor's description was OSBM Bolt on concrete block at production of hedge, 4' NW of hedge junction, E side of road junction.
Location
Grid reference: SN 4130 1488.
Landranger 159: Swansea & Gower, Carmarthen.
Structure: Concrete block.
Waypoint: OS0771.
Neighbouring Flush Brackets
| G3758 | by Idole 1.70km to the northeast. |
| G3757 | Upland Arms 1.72km to the south. |
| G5040 | Castle Green Farm 2.43km to the northwest. |
| G3759 | Cwmffrwd 2.58km to the northeast. |
| S1153 | Llandyfaelog 3.11km 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 Bishopston to Carmarthen levelling line. The surveyor's description was OSBM Bolt on concrete block at production of hedge, 4' NW of hedge junction, E side of road junction.
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