It is similar but not the same. The Cuba has 5 stripes, not 3. But thanks for the help!It looks like the lone star flag of Cuba.
It is similar but not the same. The Cuba has 5 stripes, not 3. But thanks for the help!

Enameled metal and porcelain metal are one and the same. I deal in porcelain signs for the past 30 years. Earlier on, they were sometimes called porcelain enamel. The English prefer Enameled metal over porcelain metal. The sign I posted is referred to as a porcelain sign.I've never heard enamelled metal called porcelain, surely they're quite different things?
I had found that flag photo earlier in my search, the Corinthian YC of SF. It differs in that my white stripe is tapered to the point and The SF YC isn't.Look again, I really think Corinthian YC, San Fransico is a candidate. The only difference is the white stripe is more of a triangle on yours.
Corinthian Yacht Club of San Francisco - Tiburon burgee boat flag | #519376210View attachment 201995