I'd find someone who deals in antique native pottery to find out. It certainly looks good, but who knows what lengths people will go to "age" an item. It's just a guess, but it looks to me like it is from one of the pueblo tribes. Take that with a grain of salt, I really don't know squat about pottery.
Definitely Pueblo, my dad has a collection of these various ages.
Acoma tends to be more black & white and geometric.
I'd guess Zuni, Zia, or Santo Domingo, and age would be older than 1960, and more functional than aesthetic, based on the limited designs and signs of use.
Not sure of the tribe but it appears to be authentic based on the lack of glazing, the the wearing on its design and especially the uneven rim. Great find!