Yes, it is Cirera. This is Genis Cirera Casonovas. He lived much of his life in Barcelona, where he had a workshop. They decorated glass that I've been told was made at the Gordiola Glassworks. A large volume of his work is from the 1930s, but there was later work. I don't know what year your pitcher would have been made. If you google his name, you can learn more about him and see some of the things he made. It may help you to put a date on your glass.