Hej Børge
Fundet dette via Google
http://www.roverparts.com/Model/LandRoverSeries.cfm"Land Rover Series IIA. (1961 to early 1971) Series IIA's are often referred to as "early" or "late"... the Fall of 1967 being the dividing line. The big change involved the polarity of the electric system as well as a centrally-located wiper mounted on the dash."
Så skæringspunktet er, ifølge dette, efterår 1967.
Hilsen Niels Lysebjerg i en "early IIa"