I'm proceeding immediately to another snorkel-mask in case anybody feels short-changed today by a single posting to this thread.
The Pirelli Mirella's product name does not appear to originate in Hellenic mythology this time, unless, of course you know different!
My initial take on the matter, evidenced by
Italian-language Wikipedia's "Mirella" entry, is that "Mirella" is the Italian version of the name "Mireille", a French derivative of "Mirèio" first used in a poem of the same name by French author Frédéric Mistral (above). Written in 1859 after eight years of effort,
Mirèio was a long poem in the Provençal language comprising twelve songs describing the thwarted love of Vincent and Mireille, two young people of different social backgrounds in the southern French region of Provence. The name Mireille (Mirèio in Provençal) is a doublet of the word "meraviho", which means "wonder". In the nineteenth century, "Mirella" established itself as an Italian girl's name, thanks to an Italian translation of Mistral's narrative poem and to the lyric opera
Mireille (1864) inspired by it, composed by Charles Gounod.
The Mirella made its début in Pirelli's
1959 catalogue:
The caption bills the Mirella as an observation and underwater hunting snorkel-mask manufactured in plastic for youngsters and priced at 1,050 lire. A spare breathing device was available for 530 lire.
1960
Same caption with lower price (1,000 lire) for the snorkel-mask and a polythene bag for package it. The entry below is from the 1960 catalogue of the German diving equipment company Barakuda, which imported and carried the Mirella:
German: "
PIRELLI „NEREO JUNIOR“ („MIRELLA“) (ital. Fabrikat). Kinderschnorcheltauchmaske für Nasenatmung, Maskenkörper aus Kunststoff mit seitlichem Schnorchelstutzen. Gut funktionierendes Hebelventil. Preis: kompl. DM 8,40."
Rough translation: "
PIRELLI “NEREO JUNIOR” (“MIRELLA”) (Made in Italy). Children’s snorkel diving mask for nose breathing. Plastic mask body with a socket for the snorkel on the side. Price complete: DM 8.40."
The use of "Nereo Junior" as an alternative product name for the "Mirella" is interesting as it estables a connection with the Pirelli Nereo mask, which is mentioned in Fabio Vitale's article
VIAGGIO NELLE ATTREZZATURE SPORTIVE DEGLI ANNI ’50 from which I reproduce a somewhat low-resolution image of the Nereo along with its caption:
Italian: Maschera Nereo Pirelli. Carcassa in gomma lucida di colore nera, verde o blu che racchiude, con un maggiore ispessimento del bordo esterno, l’ampio cristallo ovale; mentre il bordo facciale è assottigliato per favorire l’aderenza a qualsiasi forma di viso.
Rough translation: "Pirelli Nereo Mask. Glossy black, green or blue coloured rubber body enclosing, with increased thickening of the outer edge, the large oval lens; while the facial border is thinned to facilitate adhesion to any facial shape."
So the body of the mask is thicker where it retains the lens within a groove on the front edge and thinner where it is meant to fit snugly on the wearer's face. Masks with the thiinnest and hence most adhesive facial edges came to be known as models with feather edge skirts. The Nereo seems to have been discontinued before the end of the 1950s.
And this is where we sign off for today. I shall complete the Pirelli Mirella (Nereo Junior) story next time. Until the weekend, stay well and safe.