"VOCI" VS. "DIEGO" SIGNATURE

Even though called “Diego“, until 1965 he signed his works of art some form of “Voci“. See signature gallery below and on Antonio Diego Voci Wikipedia:

From 1962 thru 1965 Diego was represented at the prestigious Schlossgalerie (see below) and an image of a 1965 ad from a Zurich newspaper. He began signing “Diego” in 1966.

https://www.blurb.com/books/5419805-the-beauty-of-diego