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OSBM Bolt 
OSBM Bolt on concrete block at cross roads, 14' S from edge of road to Fairhill & 11' N from N edge of road to Potten End [3GL].
Location
Grid reference: TL 0050 0864.
Landranger 166: Luton & Hertford, Hitchin & St Albans.
Structure: Concrete block.
Waypoint: OS0232.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Hemel Hempstead,
6.15km 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 Great Linford to Hemel Hempstead levelling line. The surveyor's description was OSBM Bolt on concrete block at cross roads, 14' S from edge of road to Fairhill & 11' N from N edge of road to Potten End.
Location
Grid reference: TL 0050 0864.
Landranger 166: Luton & Hertford, Hitchin & St Albans.
Structure: Concrete block.
Waypoint: OS0232.
Neighbouring Flush Brackets
| S8270 | Potten End, Water Tower 948.31m to the east. |
| 835 | Berkhamsted 1.19km to the southwest. |
| 836 | Berkhamsted 1.21km to the south. |
| 834 | Berkhamsted 1.43km to the southwest. |
| S8271 | Potten End Farm 1.98km 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 Great Linford to Hemel Hempstead levelling line. The surveyor's description was OSBM Bolt on concrete block at cross roads, 14' S from edge of road to Fairhill & 11' N from N edge of road to Potten End.
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