Diamonds;
KEYSTONE (OMN) adam
• AKA: Magnet and Grape with Stippled Leaves
Adams & Company (Pittsburgh-PA, Company Operated: 1861-1891), Introduced: c1872 Introduced
• NOTE: Keystone appears in the c1872 Adams & Co. catalog.

NOTE: Sid Lethbriidge: ...goblet (aka) Magnet & Stippled Grape is documented (not attributed) to Adams & Co. as their Keystone pattern based on its appearance in a early 1870s catalog. The maker of the Magnet & Frosted Grape pattern is unknown but has been speculated as Boston & Sandwich. See the side by side comparison below that shows the differences between the two patterns.
• Motifs: (Diamonds), (Arches/Crescents), (Grapes)