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

Metal 1920 delegate badge for the 20th Annual Convention Building Trade cheapest, State of California, Bakersfield.
Calif. State Seal, Oil Rig, 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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