OSBM Bolt: Allt Briste 

OSBM Bolt on concrete.
Location
Grid reference: ND 0467 1739.
Landranger 17: Helmsdale & Strath of Kildonan.
Structure: Unknown.
Waypoint: OS1952.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Helmsdale,
1.99km to the southwest.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Lybster to Helmsdale levelling line. The surveyor's description was OSBM Bolt on concrete.
Location
Grid reference: ND 0467 1739.
Landranger 17: Helmsdale & Strath of Kildonan.
Structure: Unknown.
Waypoint: OS1952.
Neighbouring Flush Brackets
| G1987 | Helmsdale, Church 2.61km to the southwest. |
| G1988 | Helmsdale, Church 3.00km to the southwest. |
| G2097 | Ousdale School 4.10km to the northeast. |
| G1989 | Portgower, Old School House 5.67km to the southwest. |
| G4371 | Westgarty Lodge 7.53km to the southwest. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Lybster to Helmsdale levelling line. The surveyor's description was OSBM Bolt on concrete.
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