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OSBM Bolt: Pentowyn Terminal Bolt 
Pentowyn Terminal Bolt - in line with wall, Dylan Thomas' Cottage, Laugharne [3GL]; OSBM BOLT IN LINE WITH WALL DYLLAN THOMAS COTT LAUGHARNE.
Location
Grid reference: SN 3201 1047.
Landranger 159: Swansea & Gower, Carmarthen.
Structure: Unknown.
Waypoint: OS0928.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Carmarthen,
17.51km 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 Pentowyn Terminal Bolt - in line with wall, Dyllan Thomas' Cottage, Laugharne.
Location
Grid reference: SN 3201 1047.
Landranger 159: Swansea & Gower, Carmarthen.
Structure: Unknown.
Waypoint: OS0928.
Neighbouring Flush Brackets
| G4921 | Pentowyn Farm 143.18m to the northeast. |
| G5131 | Llys-Hendy 1.80km to the east. |
| G4920 | Laugharne, King Street 1.85km to the west. |
| G5132 | Llansteffan 3.14km to the east. |
| G5130 | Madras Cottage 3.15km 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 Haverfordwest to Carmarthen levelling line. The surveyor's description was Pentowyn Terminal Bolt - in line with wall, Dyllan Thomas' Cottage, Laugharne.
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