Very nice indeed!! I've had two Arpege basses, a series II fretted and a series I fretless 5. Beautiful basses, probably my favourite body shape. Yours looks like it's in amazing condition. I always found the brass laminate neck really stable, I don't think i ever had to adjust my series I once I had it set up. Shame these aren't better known but for those of us who have tried one, they're a well kept secret!
Enjoy!!