Thanks I hope it all works out as planned now. The seller seems like a nice guy - 33 years of bass playing and “reasonable” to negotiate with
He even made me a video to explain a few things about the bass (mostly intonation; how the B string sounds; how he raised the action a bit to improve (yeah, dare I say it) sustain , but also tone according to him). The one he made for me was in Norwegian, but he had also this one:
(Sounds like my kind of bass, what can I say )