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OSBM Bolt: Bullwell Terminal Transfer Bolt 
Bullwell Terminal Transfer Bolt - N side of ploughed field, S side of Milford Haven.
Location
Grid reference: SM 9034 0390.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0914.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1969),
13.45km 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 Bullwell Terminal Transfer Bolt - N side of ploughed field, S side of Milford Haven.
Location
Grid reference: SM 9034 0390.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0914.
Neighbouring Flush Brackets
| G4919 | West Popton Farm 505.96m to the south. |
| G5101 | Rhoscrowther 1.80km to the south. |
| G4977 | Milford Haven Tide Gauge Aux 1 1.90km to the northwest. |
| G5100 | Milford Haven, Pill Road 2.46km to the north. |
| G5103 | Kilpaison Burrows 3.22km 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 Carmarthen levelling line. The surveyor's description was Bullwell Terminal Transfer Bolt - N side of ploughed field, S side of Milford Haven.
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