DEEP YELLOW GREEN CD 321 REGISTERED TRADEMARK PRISM/PATENTED JUNE 17, 1890. VERY NEAR MINT!. From side view as seen in photos great character with a heavy lien on the upper umbrella portion. Slight underpour on rear of umbrella patent date is light but readable. Some fire brick scattered throughout the glass as seen in photos. Only imperfection if you can call it that would be typical flaking on the sharp mold line edge of the front of the umbrella area from excess glass pressed into mold seam during manufacture and removal from mold. And a open bubble. Base is just about perfect with just a few tiny flakes on the inner sharp edge.

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