Hallo Tone,
On this thinline guitar is any mysterious. The neck is from an Framus Thinline guitar from the begin of the 60s, examply by the model Fret Jet or New Sound. Bodys without or with painted binding built the label later on the end of the 60s or begin of the 70s.
The swithch plate, the neck pickup and the poti knobs are also from the begin of the 60s, the order and quantity from the poti knobs aren´t from Framus, the Bigsby Vibrato is also from a later time this part was construct from the begin to the middle of the 70s. I believe that the middle the bridge pickup and the vibrato was replaced.
The red finish I know from IMS models an cheap Framus label from the begin of the 70s. The bridge I can´t see good on the photo, I think she isn´t also original. This guitar is difficult to assign but I believe That the neck was replaced to another body. Regrettably we haven´t documentation over prototyps ore custom instruments from the label.
An Thinline model in this design I have naerly in catalogs or on the vintage website from the museum.
Andreas Egelkraut
Warwick/Framus Social Media Vintage