i talked to the orginal buyer and she says that it was bought in 1974 and behold..... she also found the orginal instruction manual with the modelnumber !
its a Sanyo 17-p60u or 17-p6ou depending on how you read it, i am going to pick up the manual later this week for some more investigations.
before this talk with the owner i identified most of the tubes that supposed to go into the tv and took some more pictures of different parts and numbers.
tubes:
1x 18gv8
1x 15dq8
1x 9a8
1x 16a8
1x 25e5
1x ??a?3 ( model# was torn away from the glass, see images below)
here is some more photos from the inside of it.
