Remarkable and rare sixth plate Mascher stereoscopic daguerreotype showing a well-dressed gentleman seated beside a floral-patterned table, captured on a single plate and presented in its original push-button leather case. The dual-lens effect is achieved through the precision alignment of the duplicated image on one plate, as patented by Mascher in 1852. Both images are razor sharp, with rich tonal range and subtle hand tinting to the cheeks, delivering strong three-dimensional presence when viewed with a stereoscope.

Housed in a Mascher case with red velvet pad and bold gold-stamped studio imprint: “JOS. H. MARSTON, No. 246 Nth. 2nd St. below Willow and N.E. cor. 9th & Spring Garden Sts.” — a well-documented Philadelphia daguerreotypist. The plate, mat, and glass are clean and well-preserved, with minor age speckling, typical of the format. Case shows moderate surface wear but retains full integrity with functional clasp.

Mascher stereoscopic daguerreotypes are seldom encountered, and examples from Marston are even scarcer. A true collector’s piece combining photographic innovation, uncommon format, and desirable provenance from the Philadelphia daguerreian scene.