Thanks for all the advice, guys. I'll try to answer all the questions without missing any of them.
You know, the finish may not be original. I know that it is the same finish (or whatever it is) from the 1950's, but it could have obviously been altered any time before that. I just now realized the back of it is dark, too. I do know that it wipes off very easily with a damp cloth. I made the mistake of wiping it down for the first time with a damp cloth. I didn't realize all that "dirt" on the rag was the finish/glaze. I removed quite a bit before I realized it.
You can see very clear brush strokes from a paint brush all over it. I doubt the manufacturer would be that careless. Looks like someone might have done it afterward to match their decor. You can also see that the knobs are a dark wood where the finish/glaze has rubbed off over time. So, obviously it was dark originally. I'm sorry I said it was the original finish. I guess when I thought it was made in in the 40's and it's been the same since the 50's, I thought it had to be the same as when it was made. Guess you learn somethin' new every day.
I agree that refinishing it would reveal the non-wood surfaces and it would probably look pretty bad. Although the thought of it being dark again sounds nice. All the furniture in my house is dark wood. Not a fan of oak. It seems all the antiques passed down to me are oak or oak colored though, just my luck. I just hate the fact that I'd alter our entire family's memories of it. It just wouldn't be the same buffet if I change it. I guess I'm up in the air about the whole thing.
The sides aren't wood, they are some cheapo material, too. I'm going to try to take more detailed pics of it tonight.
The label was unfortunately lost a few years ago during a move. It was stuck to the back of it. My mom doesn't remember the date on the label, but it did have all of the information on it. Sad, I hate losing things like that. Now the only writing/label type thing left are some black numbers scribbled on the back. Not a date. Nothing important, probably put on some time over the years.
Thanks for your help with all of my questions. I know this isn't some super rare piece of history or something really valuable. It just means a lot to us. And it's so much easier getting multiple opinions this way rather than hauling it around asking questions or dealing with the antique stores in my area. They aren't very polite around here!