Interesting and lucky find for Mr. Abrams. I often look at old portraits and antique postcards at fleabmarkets as well, hoping to find something like this. It never happens that I buy any or find anything interesting, though. I know one thing, I'd keep the tintype or donate it to a museum like the Smithsonian, or perhaps a museum about the Lincoln County War, if there is one there in NM.
_________________
"The only thing in life you have to earn is love, everything else you can steal." ~Hannibal Heyes