As others said, the cap isn't original. But for a buck you can't go wrong. Going by the case wear on the bottle, it has been refilled and re-used a lot.
I remember back in the late 60s-early 70s going to the store picking out all the "old" style Pepsi's and/or Cokes and assembling a 6 pack of them and saving them. They were there for the easy pickin'. Good times!