It's a pretty classic 1930's china cabinet. My grandmother had one and my DIL's grandmother had one. Don't know how old you are but unless you are perhaps 50 it's unlikely that it was your Great Grandmothers. If you are older, likely it was your grandmothers.
The thin shelves is the way they were....the metal brackets are added.
Worth keeping?...Not sure what you mean? sentiment? Yes! Value..? no?

I had one similar and when I moved I gave it to my cousin. Wish I wouldn't have. Yours is much prettier. Maybe mine looked like that before someone refinished it.

Thanks for the feedback. For a small cupboard, it holds an incredible amount of "stuff". Still not sure what I'll do with it. I've thought of painting it black, and maybe using it in a guest bath for towels, etc. Of all the old furniture pieces, the only one I'm probably going to keep is my Limbert rocker. The rest I'm not really attached to.

Wowie! Sure wish I lived in your neighborhood, I'd buy that off of you!! I love it! I live in a 1930's cottage and could use that to store my blue-delft collection :0)
The 1920's-30's is my favorite era

It looks a little earlier than the 1930's. Looks like my grandmother's from her marriage in 1906. There are so many out there and I would make something different out of it. Paint might be the way to go.