Photo's and info submitted by RODALCO:
DII series 6,10,16,20,25 Amps
DIII series 35 and 63 Amps
and 16,20 and 25 Amps inserts, note different size diameters.
DIII series 35Amps black and 63 Amps orange
Siemens & Halske, VDE (German standards) KEMA ( dutch standards )
Flink is normal, quick acting.
P.G.E.M. Provinciale Gelderse Electriciteits Maatchappij (local POCO in central, East Netherlands)
DII series 25 Amps, snail symbol is slow blow, e.g. motor rated.
DIII series, Groenpol, Dutch Manufacturer of diazed fuses and switchboards:
DII and DIII colour coded amperage indicators.
DII in 10 Amp srew cap holder:
Hazelmeijer panel in use in my basement workshop: