I think we need to separate the "itinerant photographer" from those that travelled within the County photographing local scenery.
In the 1880's/90's photography was becoming very competitive so studios would set up booths in parks, fairs, seafronts or anywhere where large numbers of people gathered.
The media used was old tintype equipment as this was instantaneous as there was no negative to develop.
So the studio could offer a "while-u-wait" service.
Those that travelled taking photos of local beauty spots, churches, landmarks & village scenes did so for commercial purposes & are commonly called stock photos.
Stock photos of people were studio portraits of royalty, national & local dignitaries & sold locally & to other studios.
What we have here falls in between. Definitely taken outdoors & of a chap who would be pretty much unknown to anyone outside his village. The original wasn't a Tintype as they were in reverse & this isn't.
The question really isn't who took it but why.
A possible explanation is that the Maltster commissioned the photographer to take photos of his employees, possibly altogether & also individually (photographers never wanting to miss an opportunity) & that's why this was identified in 1938.
We quite often see employee photos so it was a common practice.
Hope this helps.