It would require 7 players to play this being that there is 1 tuba, 1 trombone, 1 horn, and 3 trumpets (one of which has division part) and quintet means 5
For the comments about requiring 7 people, I believe move of the division is if it the higher note is not possible, and it seems otherwise the Third trumpet is optional and not that indepent and required like other parts
