I forgot to chime in about the stem bolt. Mine with the nice alloy Ambrosio Champion stem and bar combo also had a bolt with the "O" for Olmo on it. Ha, I even have a photo showing the extra long bolt!
So I'm quite confident saying that the bolt is original, or at least one with that same "O" on it. I've seen it on my example and a couple of others shared online.
-Gregory
