When was the Endeavour built?

Answer 1

Wikipedia has about 20 different Endeavours that were built between 1650 ( a 36-gun ship purchased in 1652 and sold in 1656) and 1991 (the space shuttle) please refine your question.

One of the earlier of the more famous "Endeavours" is the HMS Endeavour, also known as HM Bark Endeavour, a British Royal Navy research vessel commanded by Lieutenant James Cook on his first voyage of discovery, to Australia and New Zealand from 1769 to 1771.

Launched in 1764 as the collier Earl of Pembroke, she was purchased by the Navy in 1768 for a scientific mission to the Pacific Ocean, and to explore the seas for the surmised Terra Australis Incognita or "unknown southern land". Renamed and commissioned as His Majesty's Bark the Endeavour. So this Endeavour was not built as the "Endeavour" at all!

One of the later famous "Endeavours" is the Space Shuttle Endeavour (Orbiter Vehicle Designation: OV-105), one of the now retired orbiters of the Space Shuttle program of NASA, the space agency of the United States. Endeavourwas the fifth and final spaceworthy NASA space shuttle to be built, it was delivered in 1991, and first flew a year later in May 1992 on mission STS-49; its last mission STS-134 was in May 2011.