OSBM Bolt   

OSBM Bolt on concrete block, E side of road, 46' N from N angle of road junction opposite [3GL].

Location
Grid reference: SM 9569 2554.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Concrete block.
Waypoint: OS0593.

Neighbouring Flush Brackets

S7822	Wolf's Castle, Railway Bridge 730.27m to the north.
S7823	Weir Castle 910.88m to the south.
S0576	Wolf's Castle, School 1.08km to the north.
S7824	Treffgarne Lodge 2.47km to the south.
S0577	Corner Piece PH 3.70km to the south.

The nearest fundamental bench mark is Haverfordwest (1953), 9.70km 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, E side of road, 46' N from N angle of road junction opposite.