Made by the father - Salvador.
Some may have been from the pre-war years, but probably most were from the Ysart Brothers (Vasart) period 1946 - 1956. But note that Salvador died in 1955 and it is unlikely that he made very much during the year (or so) prior to his death.
Several are known with an etched "Vasart" mark to the base and a few are known with a "Y" cane.