Maybe I used the wrong name. Looking it up, in NL both bikes were sold under the brand name Jupiter:
On the RH side what was likely therealche's unfortunate outfit, sold as Jupiter Twin, left the Jupiter Planeta Sport. And then there's also the possibility that the writer of that book was inaccurate...
Yes Det, yours looks very much like it could be used on a farm - particularly with that seat!
Maybe it's nice to show your bikes in
viewtopic.php?f=19&t=11070&sid=49bd4063ec3df4da369b464a964b0ffe#p52989?
Edit: looking in another book of that era, I see:
So in Germany they were sold under the name ISH, and indeed the Planeta being the single, and the Jupiter the twin.