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Mascher Stereo Daguerreotype of a woman
Stereographica - Antique Photographica
Courtesy of Bryan and Page Ginns (#15 / 103)
The interior of the case is marked "Maschers Improved Stereoscope - Patent Applied For". This would suggest a very early stereoscopic image, possibly prior to the date of the patent March 8, 1853. Most Mascher cases are marked with this date.
Refer Wing pages 80/81 for more information on Mascher cases.