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More model informationOrdnance Survey Fundamental Bench Mark situated on London Road, Southampton, Hampshire. Originally setup for the Second Geodetic Levelling, England & Wales during 1912–1921 and is referred to as “Southampton (O.S.O.)”. Southampton (O.S.O.) is at 74.351 feet (22.66 metres) above Ordnance Datum Newlyn (ODN), the UK zero point based on the sea level recorded at Newlyn, Cornwall. The Bench Mark stands outside the former historic offices of the Ordnance Survey at London Road.
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