Antique popular Vintage 1920 Delegate Badge for 20th Annual Convention Building Trade State of California, Free Shipping, K1

Metal 1920 delegate badge for the 20th Annual Convention Building Trade, State of California, Bakersfield.
Calif. State Seal, Oil Rig popular, Cornucopia of Flowers, Vegetables , Animal with Bakersfield.
All three pieces have maker's mark on back. I just can't make it out.
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