Help identify a bass for me?

I was recently in Amsterdam and stopped by the music conservatory to observe the student’s final performance. The bass player was rocking it on a nice 5 string. It appears to have a semi-hollow design and had a bass clef cutout on it towards to top. I’ve searched online and found nothing. Anybody here recognize this bass?

 

Hey Adje - That's the one! Very nice indeed! Looks like its the proxima de sensi model. Sounded wonderful, but I shudder at what the price might be.