Great image. I’ve seen old copper pots patched with elaborate brass stars soldered in place, tinned inside, ready for another round. I believe that *tinker* is etymologically derived from *tin*, and that it was another name applied to gypsies. Does that ring true with you?
Yes, I believe that “tinker” and “tinner” are derivatives of this profession. There is a whole caste of Roma who have apparently specialized in copper and tin work for centuries.
It makes sense as an itinerant job as everybody would have occasional need for metal repair.
Preindustrial Craftsmanship 
Great image. I’ve seen old copper pots patched with elaborate brass stars soldered in place, tinned inside, ready for another round. I believe that *tinker* is etymologically derived from *tin*, and that it was another name applied to gypsies. Does that ring true with you?
Yes, I believe that “tinker” and “tinner” are derivatives of this profession. There is a whole caste of Roma who have apparently specialized in copper and tin work for centuries.
It makes sense as an itinerant job as everybody would have occasional need for metal repair.