The Mares 1121 of
1959 was a C-shaped snorkel fitted with a curved bend and an automatic shut-off valve at the top of the barrel:
If you have read this subforum's thread dedicated to Cressi of Italy, you may recall the "Gamma" valve patented by Luigi Ferraro for incorporation into Cressi snorkels and snorkel-masks:
The hinged float valve at the supply end of the Mares 1121 snorkel operates on the same principle, automatically closing the air inlet and preventing water ingress during submersion. There was another curved bend at the bottom of the barrel, terminating in a straight mouthpiece with a bellows-type neck. This mouthpiece design is particularly associated with the Beuchat "Silent V" snorkel made in Marseille:
Here is a close-up of the Beuchat mouthpiece with the accordion style neck designed to enhance mouth comfort:
The Mares 1121 snorkel reappeared in the company's
1963 catalogue:
The caption "Art. 1121 - B. Con Valvola" translates to "Item 1121 - B. With Valve". Note the letter "B", because this model's successor in
1969 had a change of stock number to 1301 but kept its letter designation, "Tipo B":
Italian: "
Articolo 1301 tipo B. Con galleggiante munito di valvolina a tenuta d'acqua."
English: "
Item 1301 model B. Provided with a floating valve."
French: "
Article 1301 modèle B. Embouchoir courbe. Tube avec obturateur."
Note how a U-shaped flexible rubber elbow with a mouthpiece at one end has replaced the accordeon-style mouthpiece at the demand end of a barrel with a lower bend. The "B-type" float-valve snorkel was conspicuous by its absence from 1970s Mares catalogues.