Hi Oran, pretty sure you already saw this:
[youtube]http://www.youtube.com/watch?v=i340NHl9448[/youtube]
It might just be the most authentic 1959 Chief on the net that you might run across
As I already wronte, your's is still a little different with the triangular toolbox, that was only fitted to the very first series of Enfield Chiefs in 1958. According to my list your's is No. 251, mine is No. 307.
There are some inaccuracies, like the smaller tank that might be off a Trailblazer as well as the magneto ingnition and the head steady, the Chief should have two plates like the Interceptor. Maybe there was a mixup between a Trailblazer and the Chief? Maybe Tank and frame got replaced? To be sure, you might ask Graham Scarth from the REOC. he can check for the correctness of frame and engine numbers and maybe tell you a little about the bikes history (the part you don't already know).
So long,
Andreas