Yeah, you may be right. The handlebar on mine --of the same vintage, within a month-- doesn't have the long straight section at the top, but that doesn't necessarily mean anything. I can't prove mine is original, I can't prove the other one isn't; maybe they both are, maybe they both aren't. At any rate, here's mine:
In spite of the condition, I love that bike! It's a crying shame you saw it before I did, because I'd have definitely plunked down the cash...have you figured out yet what shifter you'll use on the bike? I think the one currently on it is rather quaint.