Bands/Rings;
DUNCAN, GEORGE & SONS No. ..90 (OMN)
• AKA: Open Cryptic; Zippered Block
Duncan, George & Sons (Pittsburgh-PA, Operated: 1874-1891), Introduced: introduced 1887

• Motifs: (Bands/Rings), (Squares/Rectangles), (Ladders/Zippers)

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