DOYLE & CO. No. .21 DOT (OMN) stem
• AKA: Bennington Inverted Thumbprint (Metz 21, Page 20)
• Doyle and Company (Pittsburgh-PA, Company Operated: 1855-1891), Introduced: mid 1880s Introduced

• Motifs: (Hexagon, Large), (Honeycomb), (Optics)