I can't see any way to get that into base-6.
However, it could certainly be base-12 (the mayan/aztec system is base-20 by using up to 4 lines, using 3 lines with a max of 3 dots would give 12).
If you grouped those into sets of 3 (giving 3 sets of 3) and then converted to decimal - AFAICT it would give one of these (top-down or bottom-up):
900, 471, 1055
1627, 471, 42
[that's assuming 4 dots=zero]
A set of 3 numbers, is something we can all slobber over.
900,471,1055 gets you near PRAEA EUQ GH-R C19-0 - Close but no cigar
1627, 471, 42 is in PLIO EURL IU-L B51-0 - Not really close to anything
Could you spot something in there that might not be a numeric bit, but be a +/- sign ?