From “Maria Just-Sayin”…

“I found this pin in my Grandmother’s jewelry box. She was from Asturias.”
Many Spanish immigrants in the US were fervent supporters of the Spanish Republic that came under attack when General Franco and other military leaders staged a coup d’état in July, 1936. Memorabilia like this one are very commonly found among their personal effects. The pin was probably acquired by your grandmother at a pro-Republican rally that would have taken place between 1936 and 1939.