I'm pretty new to woodworking, and even newer to the beauty of the plane. I was given this plane last night. Apparently it belonged to my great-great-grandfather. Not sure if anyone here can tell me anything about it, whether I should tune it up and use or just keep it on a shelf to look good. It doesn't appear to be a Stanley plane based on the little reading that I have done on the internet. The only apparent markings seem to be a stamped letter "U" in a circle and "Made in the USA" behind the frog. I also took a picture of the mouth, other than the rust this really only seems to be the worst part, looks a little uneven in the corner, but there are no cracks or anything.
It is 2 1/4 inches wide and 9 1/2 inches long.
Let me know what you guys think I should do and if you can point me to any resources or any good books on hand planes, etc.
Thanks.