have the chance to get a 50s frame (i dont remember if he said 53 or 58) + sprocket + Crank + Chain for $75. Looks like there has been a little repaint on the front. The rack has been repainted with a tragic ghost flame on it but it is solid. I did some pricing and it's a little all over the map. I am wondering if this seems like a solid deal? I am feeling like it is but would like any advice or maybe some things to look for when deciding. Thanks. He mentioned that it was a locking head tube? What does that refer to?