....I found the Polar Studios Mellotron....at Polar Studios no less!
For a look-see, go to:
http://www.polarstudios.se/studios_right_studioa_vr.html Following the instructions beneath the window to scroll and zoom
around the room. Scroll to the right to find it, just look for the
(only) white keyboard in the room!
FS. Weller (I wonder if #574 and this 400 were ever in the factory at
the same time??)