OSBM Bolt   

OSBM Bolt on concrete block, SE side of road opposite hedge junction.

Location
Grid reference: SM 9567 2140.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Concrete block.
Waypoint: OS0590.

Neighbouring Flush Brackets

S0577	Corner Piece PH 444.07m to the north.
S7825	Southlays 1.02km to the south.
S7824	Treffgarne Lodge 1.70km to the north.
S7826	Tangiers 2.87km to the south.
S7823	Weir Castle 3.23km to the north.

The nearest fundamental bench mark is Haverfordwest (1953), 5.60km 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 Cardigan levelling line. The surveyor's description was OSBM Bolt on concrete block, SE side of road opposite hedge junction.