I have to think this would be my great grandfather or great grandfather's brother-just a hunch though.
My grandfather, Leonel Silveira, was born in California, around 1920's, (I'm only "pretty sure" of this, actually - he may have been born on Faial) his family had moved to California from Faial. He then moved back to Faial and stayed there until 1959 when the volcano exploded and he moved to New york.
He came from a family of 9 or 10-Faial is not all that big (but what a BEAUTIFUL island!!) so I wonder how many Silveira's there could be that moved to California around that time.
Email me so we can compare notes if you like - I also am looking for info on my ancestors from Faial.