Does anybody know anything about 83D30L5, or 83D3015, or 83D3OL5, or 83D3O15? 

I think that the two characters in question are a zero and a "L", but there is an indentation at the end of the fretboard and it sort of occludes the left side of the second to last character.

Many thanks, and have a good weekend!

-Zut8083

The number would have to be 83D3015 based on Alembics serial numbering scheme.
83 = year,
D = Distillate,
3015 = production number.

http://www.alembicguitars.net/support/reference.html

Very late (maybe last one) from '83: http://www.fcbass.nl/alembic/10.htm#83 :-)

Thanks for the insight and clarification, especially when the bass was likely made.

Here's the details from the file:

top: Zebrawood
accent: none
body: Mahogany
neck: 5-piece Maple and Purpleheart
scale: 32" medium
fingerboard: Ebony
inlays: Pearloid (plastic) ovals
body shape: Scorpion Heart Omega
peghead shape: Says "8-string type peghead" but that doesn't get very specific
pickups: AXY, special pickup position is stated, but the exact change isn't noted
originally made for: Music Shop, Germany
birthday: December 30, 1983

I have a note that this was for sale at Station Music in Germany in November of 2016.

Thanks, Mica, this made my day!

Cheers,
Zut