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OSBM Bolt 
OSBM Bolt on milepost 'Haverfordwest 1', N side of road [3GL]; OSBM BOLT MP 1 MILE HAVERFORDWEST 0.3M N SIDE RD.
Location
Grid reference: SM 9767 1603.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Milestone.
Waypoint: OS0584.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1969),
983.72m 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 milepost 'Haverfordwest 1', N side of road.
Location
Grid reference: SM 9767 1603.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Milestone.
Waypoint: OS0584.
Neighbouring Flush Brackets
| G3236 | Little Clarboro Farm 1.34km to the east. |
| S0586 | Haverfordwest, Prendergast Hill 2.01km to the west. |
| S7827 | Withybush, The Hermitage 2.12km to the northwest. |
| S7828 | Haverfordwest, Post Office 2.23km to the west. |
| S7599 | Haverfordwest, Council Offices 2.47km 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 milepost 'Haverfordwest 1', N side of road.
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