The publisher, Walter Lehning, lists this book as a "Liliput" mini-comic, butas you surmise, it is larger than the earlier "Liliiput" Fulgor, Akim, Blauwe Pijl, and Jezab single-tier 1 or 2-panel, horizontally-oriented mini-comics that were about 22 cm long and 8.5 cm wide. It is also larger and taller than the Fulgor 1st series, and "Dolf Staal" Spar Supermarkt series. This 2nd Fulgor, vertically-oriented, full-colour series, seems to be about 65% as large as normal vertically-oriented European comic books of that time, which were fairly close to the size of US normal comic books of the 1950s, except a bit narrower, but a littler taller. So, in being that much smaller, they qualified as "mini-comics", but were a fair amount larger than Fulgor's 1st one-tier series. The writer and artist was the well-known German artist, Hansrudi Wäscher, the writer and artist of "Siguurd" (The German clone of "Prince Valient"). I guess The Italian publisher hired Wäscher to draw Fulgor's 2nd Series, as Augusto Pedrazza was no longer available.
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Fulgor series 2 - 3 - Piraten In Het Wereldruim