Ordnance Survey Benchmark (OSBM) used for levelling height above Ordnance Datum (OD).
Height (1955): 136.6125m OD (Newlyn). Mark verified by the Ordnance Survey in 1977. Description: FL BR S0756 SE FACE E ANG PO CROSS RDS. 1.0m above ground. 1st Order BM. The shop is no longer a Post Office.
The bracket was used on the Aberystwyth to Lampeter line (G092) of the Third Geodetic Levelling of England & Wales in 1955. Description: SE angle of shop at crossroads, Llangysi. Abstract G 65:
Link [OS 54/754]
The bracket was previously used on the Lampeter to Devil's Bridge secondary line of the Second Geodetic Levelling of England & Wales in 1952. It was levelled with a height of 448.327' above OD (Newlyn). Description: Flush Bracket on SW angle of building, NW side of road, Llangybi. Abstract S 1:
Link [OS 54/633]
Context:
SN6053 : OSBM Flush Bracket S0756 - Llangybi Post Office