Diamonds;
DUNCAN, GEORGE & SONS No. ...1 GRAPE MUG (OMN)
• AKA: Grapevine Variant
Duncan, George & Sons (Pittsburgh-PA, Operated: 1874-1891), Introduced: Unknown Date
• NOTE: No. 1 Grape Mug is the smallest of 3 sizes.
NOTE: Sid Lethbridge - One of the larger versions is shown on page 29 of the Mordock and Adams Pattern Glass Mugs as (aka) Grapevine Variant.

• Motifs: (Diamonds), (Grapes)