S.E.E. stands for small emplacement excavator,and here's a link to one

http://www.motorcities.com/contents/99KME230109066.html

Bear

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W123 '82 300D red 202,000 miles

G460 '83 280 GE LWB 69,000 miles

Mercedes-Benz Club member
http://www.mercedes-benz-club.co.uk/

S Klasse Club Deutschland
http://www.s-klasse-club.de/