Hand Painting the Bullet tank - When did they started ?

One of the iconic features of the Royal Enfield 'Bullet' is its hand painted pinstripes on the fuel tank and if are you a Bullet lover who keeps exploring the passion of the legendry brand then you must have seen the interesting video of Magic Hands - Painting the fuel tank of a Royal Enfield Motorcycle .

While for many the golden border is the mark of the original “Bullet’ styling, I’m really a kind of curious about how old are these lines on the Bullet tank ?

I mean when did they actually started hand painting it? are these strips as old as the legendry marque ? Has it a beginning at Redditch, England or later sometime in India where they still seem to continue the tradition at the Chennai factory. Here are some of early pictures of British bullet  around 1950s and of some Indian production.

So what do you guess ?