DOYLE & CO. No. .58 DOT (OMN) stems
• AKA: Ferguson Inverted Thumbprint (Metz 1, p 202); Ferguson Inverted Thumbprint – Faceted Stem (Unitts 1, page 40)
• Doyle and Company (Pittsburgh-PA, Company Operated: 1855-1891), Introduced: mid 1880s Introduced
• NOTE: Ref Unitts p40 (top row, right)
NOTE: Large circular optic elements with just 6 full rows of optic.
• Motifs: (Circles/Balls), (Optics)