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OSBM Bolt 
OSBM Bolt on S parapet of Canaston Bridge.
Location
Grid reference: SN 0677 1514.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0582.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1969),
10.06km 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 S parapet of Canaston Bridge.
Location
Grid reference: SN 0677 1514.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0582.
Neighbouring Flush Brackets
| G3232 | Robeston Wathen 1.72km to the east. |
| G3231 | Cotts Farm 2.71km to the east. |
| G3233 | Pricketts Gate 3.01km to the west. |
| 11526 | Narberth, Post Office 4.17km to the east. |
| S0695 | Narberth. Market Hall 4.18km 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 S parapet of Canaston Bridge.
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