Horse and Buggy from Grandparents House

It's an old horse and buggy and looks really cool, but don't know much about it. Found it in my grandparent's place, who my grandmother grew up in the Depression and saved everything. How do I determine the age or additional information on stuff like this? It is all wood and is approximately 13" long and 6.5" high. The straps are leather and there some metal loops for the reigns. No screws or anything else.
I also have another horse with a different kind of buggy that will show picture as well.
I would like to keep them, but if they are valued at a lot, then I would have to sell for my grandparents. But here, I just need any help you experts can help me with. Not sure if folk art or what. Guessing it's from the 1940's or 1950's.
Thank you so much!