Bausch and Lomb Three Focus RO and C Co

Date: c1902
Notes: This is the main lens from my 1902 Pony Premo 6, but the example black and white photos were taken on the 4×5 Speed Graphic, even though this is nominally a 5×7 lens.  The Pony Premo 6 uses 5×7 plates, but the bellows create blocks that result in only 4×5 exposures.