This is part of another more general topic: https://en.numista.com/forum/topic144509.html
Currency code: 3059 • catalonia_principality
There are 22 coins that should use the denomination of 1 Seiseno.
For example: Google search
Now these coins use the denomination (and only is used in these coins):
9678 • 3059 → 6 Deniers - 1/40
According the subdivisions of the currency, the numeric value is correct:
1 Libra = 1 Pacifico = 20 Sous → 1 Sou = 1/20
1 Sou = 2 Seisenos = 6 Dobler = 6 Ardite = 12 Dineros → 6 Dineros/Deniers = 1 Seiseno = 1/2 * 1/20 = 1/40
The denomination 6 Deniers should be renamed to
1 Seiseno
(numeric value is same: 1/40).