Puzzling Coca-Cola Can

My parents went on a vacation over the summer and this is the souvenir they brought home for me.

And what makes this can so special? I thought as I removed it from the gift bag.  And then I noticed it was a puzzle.  I took the can out and removed the plastic from around it and the can looked remarkably real.  It even had a fake tab on the top.

I wasn't sure how a can could be a puzzle, but when I removed the first few pieces I saw the puzzle was just a shell around a central core.

Each piece has a recessed circle which fits snugly on the pegs around the core.  Although this puzzle only has forty pieces, it's still a challenge.  

As with any other puzzle, it's easiest to start with a border.  In this case, either the top or the bottom edge of the can.