KEYSTONE (OMN) adam by Adams & Company/Pittsburgh-PA (Company Operated: 1861-1891), c1872 Introduced

• AKA: Magnet and Grape with Stippled Leaves
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.

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Glass Display
Shape: Catalogue/Ads
Contributor: Tom Bredehoft, MAGWV
Glass Display View
Shape: Pattern Comparison
Contributor: Sid Lethbridge 7/3/2026
Glass Display View
Shape: Table Sets
Contributor: Andy Eckroth
Glass Display View
Shape: Spooners/Spills
Contributor: Ed Perva
Glass Display View
Shape: Sugars
Contributor: Donald Robbins, Andy Eckroth
Glass Display View
Shape: Stemware
Contributor: Ed Perva, Matthew Cox
Glass Display View
Shape: Bowls & Berry Sets
Contributor: Susan Smith
Glass Display View
Shape: Bowls & Berry Sets
Contributor: Susan Smith - flint bowl
Glass Display View
Shape: Finials
Contributor: Donald Robbins