Exceptional lot of four (4) architectural stereoviews capturing landmarks and mansions of early San Francisco.

On original card mounts (two orange mounts with purple-pink versos, two yellow mounts) published by Thomas Houseworth & Co. and Lawrence & Houseworth, San Francisco, ca. 1864–1870. Views include: 

1.) View on Harrison Street outdoor albumen stereoview. San Francisco, California: Thomas Houseworth & Co., [1864-1870]. Publisher's imprint and series identification printed to mount recto. Period ink to mount verso

View of the grand Second Empire and Italianate residential blocks on Rincon Hill, looking past stepped garden retaining walls and timber terraces.

2.) Mercantile Library outdoor albumen stereoview. San Francisco, California: Thomas Houseworth & Co., [1864-1870]. Publisher's imprint and series identification printed to mount recto. 

A commanding architectural view depicting the monumental three-story classical facade and columned portico of the library, which was completed in 1868.

3.) Residence of John Parrott, Banker. outdoor albumen stereoview. San Francisco, California: Thomas Houseworth & Co., [1864-1870]. Publisher's imprint and series identification printed to mount recto. Publisher's imprint printed to mount verso. 

 An imposing street view of the grand classical Italianate villa erected by Virginia-born banker and merchant John Parrott on the corner of Harrison and Third Streets (Rincon Hill).

4.) Residence of Charles L. Low, Harrison Street outdoor albumen stereoview. San Francisco, California: Thomas Houseworth & Co., [1864-1870]. Publisher's imprint and series identification printed to mount recto. Publisher's imprint printed to mount verso. 

A sharp, detailed study of the expansive Second Empire mansion built by prominent merchant and civic leader Charles L. Low, featuring ornate mansard roofs, dormers, and bay windows. Retains a period 2-cent blue Washington internal revenue tax stamp on verso, dating the publication firmly to the Civil War tax window (1864–1866).

[Stereoview, Stereocard, San Francisco, California, Western Americana, Thomas Houseworth, Lawrence & Houseworth, Rincon Hill, John Parrott, Banker, Charles L. Low, Harrison Street, Mercantile Library, Bush Street, Architecture, Gilded Age, Civil War Tax Stamp, Revenue Stamp, 19th Century Photography]

Very good condition overall. The albumen prints exhibit rich tones, crisp focal definition, and strong contrast. Yellow card mounts retain very clean versos with crisp, intact publisher labels, one with a partial, intact Civil War-era tax stamp; orange mounts exhibit minor peripheral moisture staining to versos not affecting the albumen images.