For this
https://en.numista.com/catalogue/pieces71369.html
I see:
ASIS
BSIS
ESIS
but correct mints letters are:
ASIS[SYM1]
BSIS[SYM2]
gamma SIS[SYM3]
delta SIS[SYM4]
epsilon SIS[SYM5]
from:
http://www.catbikes.ch/coinstuff/fel-temp-others.xls
and
http://numismatics.org/ocre/id/ric.8.sis.243