Hello collector friends,

I was offered an autograph and I need your expertise and opinion as to whether the autographs are real and what price would be appropriate here.
This is an autograph card from the band Kraftwerk.
On the back are the autographs of the band members Ralf Hütter, Florian Schneider, Karl Bartos and Wolfgang Flür.

I thank you in advance for your kindness to help me.

Regards,
Christian