Hamilton Watch Company (Lancaster, PA, founded 1892) began sourcing Swiss-made movements in the 1950s–1960s to supplement domestic production; Certina (Kurth Frères SA, Grenchen) supplied Hamilton automatic calibres including the 28.45. Hamilton fully ceased Lancaster manufacturing in 1969, shifting all production to its Swiss subsidiary Buren.

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Manufacturer Movement
Buren Watch Company Automatic 17.5 mm
Buren Watch Company Automatic 17.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 31.02 mm
Buren Watch Company Automatic 31.02 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.55 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 31.02 mm
Buren Watch Company Manual 23.69 mm
Buren Watch Company Manual 25.94 mm
Buren Watch Company Manual 25.94 mm
Buren Watch Company Automatic 31.02 mm
Buren Watch Company Manual 43 mm
Buren Watch Company Manual 43 mm
Buren Watch Company Manual 43 mm
Buren Watch Company Manual 43 mm
Buren Watch Company Manual 43 mm
Buren Watch Company Manual 43 mm
Buren Watch Company Manual 45.12 mm
Buren Watch Company Manual 23.69 mm
Buren Watch Company Manual 12.15 mm x 15.9 mm