Royal Enfield of India, formerly British, the oldest motorcycle company spanning three centuries.
This British engineering company build a lightweight bike suitable for parachuting in during the war. Later the Indian Government made a large purchase and assembled and made parts and eventually took over manufacture in Chennai under licence when the company closed in Reddich.
The Bullet retains the fifties look while modern features are available and several models are exported far and wide finding their way to Newcastle. (Wikipedia etc)
An Australian company organizes motorcyle tours and the Royal Enfield seems to be the choice for the Himalaya tour.
Enfield was also a small arms factory hence "build like a gun goes like a bullet"
Similar vintage? An amazing collection of BSA's at rail Stasiun Siantar, Sumatra, a few years ago.