If I am not mistaken he might have some dark blue calf. I thought he offered a dark blue calf some time ago.I have a reply from Marco regarding Dark blue nabuk Diva with dark blue nappa base:
"As far as dark blue Nappa I'll find something closer to dark blue Nabuk since Nabuk is darker and match wouldn't be the top. We surely have a dark blue calf to match dark blue Nabuk on your Diva."
I don't know how he will find dark blue calf but this is sounding like its going to be a really good combination!