Re: Is it vintage?
They don't look like Martin tone holes to me. I looked at the pictures carefully. I saw one other Elkhart sax that was definately a Conn. I originally thought they were all made by Conn, but as definition posted, they were also made by Buescher. As I said both the Buescher True Tone and the Conn New Wonder are very similar. Gus Buescher worked for Conn before starting his own company in 1895. He designed the original Wonder series saxophone for Conn (1895-1917) The New Wonder had a few newer features, such as rolled tone holes and better keywork. Your sax looks identical to a Buescher True Tone and I am 99.99% sure that it is made by Buescher.
I would change the pads. Even if the pads still seal, and I'd be surprised if they all do, the newer resonator pads are MUCH better. As for the plating, I would just clean it up real good. Replating is quite costly. It's a vintage horn. It's bound to have a few battle scars and wear marks. That's what gives it character.
After you have it restored, you'll want to keep it in a warm dry play. Don't put it in a garage or a damp environment. After playing it, be sure to swab it out a couple times. You'll want to get a case for it if you don't already have one. I would buy a couple reed holders; the type that flatten out the reed, a silk swab , cork grease, a small bottle of valve oil, and a nice Neotech strap for it. You're probably going to want a better mouthpiece too. I use a Selmer Brillhart Ebolin mouthpiece on my New Wonder and t sounds pretty good.