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Bench Mark, The Church of St Laurence

The bench mark is on the north-east wall of the tower. For a view of the church ST9515 : Church of St Laurence, Farnham and Link
A bench mark is an Ordnance Survey arrowhead sign found on walls, bridges, churches and specially erected triangulation pillars where the altitude above sea-level has been accurately measured by surveyors. The arrowhead points to a horizontal line above it which marks the exact altitude.
With rivets and pivots there is no datum (horizontal line) cut, the pointed-to horizontal surface defining the datum height.