French  bar-limb microscope with  Varley  stage. 

Trade label of John C. Sack, San Francisco. c. 1875

French bar-limb microscope with Varley stage. Trade label of John C. Sack, San Francisco. c. 1875

 Trade label of John C. Sack, San Francisco. c. 1875

French bar-limb microscope with Varley stage. c. 1875

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