Royal Enfield was a brand name under which The Enfield Cycle Company Limited of Redditch, Worcestershire sold motorcycles, bicycles, lawnmowers and stationary engines which they had manufactured. Enfield Cycle Company also used the brand name “Enfield” without the “Royal”.
The first Royal Enfield motorcycle was built in 1901. The Enfield Cycle Company is responsible for the design and original production of the Royal Enfield Bullet, the longest-lived motorcycle design in history.
Royal Enfield’s spare parts operation was sold to Velocette in 1967, which benefitted from the arrangement for three years until their closure in early 1971. Enfield’s remaining motorcycle business became part of Norton Villiers in 1967 with the business eventually closing in 1978.
https://en.wikipedia.org/wiki/Royal_Enfield
The Royal Enfield Bullet was originally an overhead-valve single-cylinder four-stroke motorcycle made by Royal Enfield in Redditch, Worcestershire, now produced by Royal Enfield (India) at Chennai, Tamil Nadu, a company originally founded by Madras Motors to build Royal Enfield motorcycles under license in India. The Royal Enfield Bullet has the longest unchanged production run of any motorcycle having remained continuously in production since 1948. The Bullet marque is even older, and has passed 75 years of continuous production. The Royal Enfield and Bullet names derive from the British company which had been a subcontractor to Royal Small Arms Factory in Enfield, London.
https://en.wikipedia.org/wiki/Royal_Enfield_Bullet
The core engine was acquired in the USA. The parts needed to make it a complete engine came from Australia, Canada, India, the UK, and the USA. Other miscellaneous parts were sourced in countries not mentioned above.
Royal Enfield Bullet Illustrated Spare Parts Book – 350 & 500cc 1990 – 1999 Royal Enfield Bullet Service Manual