Jerry, as a photographer, here's an aspect I didn't address, and maybe you have thoughts:
This is a large photo, measuring 4 5/8 x 7 3/4" begging the question, what was the camera if this was 1892? Dr. Kirk was a physician, J Robinson a well-to-do merchant. One of the few (Kodak) cameras available with that size film was the Eastman Interchangeable View (1886-1890) and cost $100 without lenses.
One of its multiple backs measured 5x8" - and could have been trimmed down to make this print.
Note also that the overall focus of the photo is good, but the upper left and upper right person in the photo are blurry - I suspect this may have been spherical aberration from the lens (a Beck autograph rectilinear lens was commonly used in this camera, but I don't know its failings).
If it was a smaller format camera, and there were many by 1892, then the photo would have to have been enlarged - not commonly done at this time.