Here is the first generation of the SQUALE mask marketed by Paul Dubois, inspired by the mask designed by Frédéric Dumas with a truck inner tube.
This dates from 1957 because the flyer sports the palm of gold obtained at the Cannes Film Festival by the film the world of silence in 1956.
SQUALE glasses in blue rubber, it dates from 1956
SQUALE mask in white rubber with flyer without palm of gold, therefore the mask probably dates from 1955.
Second generation black rubber SQUALE mask , probably from the late 1950s, early 1960s.