Marked Centenmann Los Angeles on the back… The item “Antique Centenmann Los Angeles County Oil Derricks Mission Pin Medal 2 1/4 Inch” is in sale since Thursday, November 28, 2019. This item is in the category “Collectibles\Historical Memorabilia\Cities & Towns”. The seller is “gypsiegirlz” and is located in Healdsburg, California. This item can be shipped worldwide.