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Cut Mark: Cross Ash 
Old B.M. on gatepier at Post Office, N. of Cross Ash Farm [2GL] =?= GTP NE SIDE ENT SE SIDE RD JUNC (197.5775m ODN, 0.2m AGL).
Location
Grid reference: SO 4068 1974.
Landranger 161: Abergavenny & The Black Mountains.
Structure: Gatepost.
Waypoint: BM2568.
Neighbouring Bench Marks
The nearest fundamental bench mark is Abergavenny,
10.14km to the southwest.
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 648.2090 feet [197.5741 metres] above mean sea level (Newlyn datum). It was included as a side level on the Brampton Abbots to Abergavenny levelling line. The surveyor's description was Old B.M. on gatepier at Post Office, N. of Cross Ash Farm.
Location
Grid reference: SO 4068 1974.
Landranger 161: Abergavenny & The Black Mountains.
Structure: Gatepost.
Waypoint: BM2568.
Neighbouring Bench Marks
| BM | Three Salmons Inn 854.28m to the southwest. |
| BM | Llanvetherine, Church 4.98km to the southwest. |
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 648.2090 feet [197.5741 metres] above mean sea level (Newlyn datum). It was included as a side level on the Brampton Abbots to Abergavenny levelling line. The surveyor's description was Old B.M. on gatepier at Post Office, N. of Cross Ash Farm.
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