I’d be interested!
Mexican posters are my primary collecting area.
Most of the ones I have are pretty dear to me, but I do have some duplicates.
The 1940s and 1950s are also my main focus, and I also mostly avoid SF/horror/luchadores.
Unfortunately my life is pretty hectic right now working from home with three young kids, so I don’t have much time to go digging through the flat file to remind myself which titles I have in duplicate (yeah, I don’t have a good cataloguing system). But it’s nice to connect with another collector of Mexican paper!
As to why I collect Mexican posters, I just like the artwork!
The Mexican film industry got a lot of state support during the Golden Age of Mexican Cinema, so there are a lot of Mexican made films with unique art on the posters. It’s like it’s own little island of collecting separate from Hollywood and the European art house films and everything else. And with a few exceptions (Bunuel is one), most of the Mexican movies have remained pretty obscure to audiences outside Mexico. So there is a lot to learn and discover.