As there are no takers and I have to go to the UK due to a family illness, I'm going to close this and open the field to someone else to ask a question.
I was looking for N7071, being the first of only five B707-227s built, being Braniff's first B707 ordered and only the second B707 to crash, during pre-handover training on 19 October 1959, just two months and four days after the first 707 crash, an American Airlines B707. Thus the aircraft was never used for its intended purpose. Four of the eight on board the Braniff aircraft survived, none of the five on board the American aircraft did.
Both accidents were due to handling problems and it was this that led some authorities, notably the UK to insist on the addition of a ventral fin, something the US authorities came to require. Boeing then increased the height of the tail fin on new aircraft and retrofitted them on earlier builds but the ventral fin was kept on pure jet 707s. On later 707s and 720s there was a shorter ventral fin to prevent over rotation on take off and only the later advanced 300B and C series had no ventral fin.
The 200srs with the JT4A engine was unique to Braniff who needed extra power for take off at some airports in South America, the JT4A being made redundant by the JT3D fan jet fitted to all 320B and C models which soon followed.
The surviving Braniff aircraft all received the pastel shade colour schemes thus, in the terminology of Braniff's marketing of the time, they ceased to be plain planes.