Pair of Tetofsky Apples, 19th Century Theorem Watercolor with Printed Text

I can never say no apples--and a bunch of grapes today too; this is one of three later 19th c. theorem-style watercolors of fruit I've just listed, found together in New Hampshire. I've bought and sold a number of watercolors of specific fruit specimens done in this manner--looking almost like airbrush paintings (and indeed these were likely done by blowing the color with a glass straw, then hand-painting the details.) With printed text identifying the specimens at bottom--in this case the Tetofsky apple, a Russian variety, known for its tartness--perhaps they were done for a commercial purpose (fruit catalogue or orchard farmer's growing notebook?) but I'm not certain. I especially like the framing/cropping on this one, and top edge with a bit of cloth attached, making it appear as if extracted from a notebook or folio. 

7 7/8" x 5 1/4" and in good condition, with scattered spotting/toning, somewhat more pronounced in photos than in hand, and to my eye not at all detracting.