This artist’s medium is china marker on metal. Recurring theme seems to be some kind of shell.
He or she is quite prolific, you can see his work around the Tenderloin and Civic Center.
One by stencil artist Eclair Bandersnatch.
Spotted this vintage button in the grass, in Civic Center, near the farmer’s market. It’s from the early 1970s and refers to Vice President Spiro T. Agnew. Somehow it became unstuck in time.