Denis Gifford reports the publisher as "SNPI (Miller)", with issues #50 (February 1952) to #87 (1954), but at least two further issues have surfaced.
S.N.P.I. is quite possibly the French packager of the material, which seems to have been from a French newspaper strip.
The character, although a masked vigilante, bears no relation to the Johnston McCulley character, further expanded on by Hollywood and Walt Disney.