If I remember the past discussions on this correctly, most modern Alembics have polyester finish. Older instruments (mid 80's or so) were catalyzed polyurethane but this finish isn't as hard as polyurethane, so they don't stay as shiny. I think non-gloss instruments might be polyurethane as well.
The fingerboard on all Alembics is unfinished ebony, unless you custom ordered something else.