here is a site that I like http://perso.wanadoo.fr/marc.esprit/
. this guy has a huge restore project
have a special look to "celestin". This kind of single cylindered tractors were very popular in europe until the 50's. the "Vierzon French Society" was bought by CASE in the early 60's and the production of these machines stopped.
No "harvest show" can happend in france without at least one Vierzon or Lanz tractor to power the treshing machine. Their noise, especialy at idle is so impressive! Well, starting is another adventure.
of course the site is in french, but there is a lot of pictures...