Thrifted Vintage Barbie Side Profile

So I was lucky about 2 weeks ago to walk into my local thrift store and see this vintage Barbie sitting on the shelf - for $1. I believe she is one of the original pony tail Barbies...possibly a #4. She does not have the metal holes in the bottom of the feet, and the stamp on her butt is kinda smudged and blurry so I can't really read it. She has the painted finger and toenails and has a very heavy dense weight. She has holes where the earrings use to be, but this is how I found her. I would like some suggestions on which Barbie this is, and if there is any way I can get her fixed back up. I would love to add her to my Vintage toy collection but also need to know what her original outfit was (if it is the black/white bathing suit) and how else I can restore her. As you can see she is dirty, her (original) hair is kinda messy, and she has dirt. The bottom of her left leg is kinda bent too (probably from being in a toy box for the last 40+ years). Any info would be greatly appreciated!!

Done