Question: In which period did this type of film emerge of which Texas, Adios directed by Ferdinando Baldi and starring Franco Nero is a good example?

Context articles: Django, Prepare a Coffin
Carambola!
Terror Express
Texas, Adios
Long Lasting Days
Io non protesto, io amo
Carambola's Philosophy: In the Right Pocket
Spaghetti Western
Detective Belli
Ten Zan: The Ultimate Mission

Django, Prepare a Coffin (Italian: "Preparati la bara!"
 , “Prepare the Coffin!”)
, alternatively titled Viva Django, is a 1968 Italian Spaghetti Western film directed by Ferdinando Baldi.
 The film stars Terence Hill in the title role, which was previously played by Franco Nero in Sergio Corbucci's original film"."
 "Django, Prepare a Coffin" is unique among the plethora of films which capitalized on Corbucci's in that it is not only a semi-official, legitimate follow-up, but was also originally intended to star Nero.
Carambola!
 (Italian: "Carambola" , also known as "Strange Adventures of Coby and Ben") is a 1974 Italian comedic Spaghetti Western film co-written and directed by Ferdinando Baldi.
 It was the first film starring the duo Michael Coby and Paul L. Smith, a couple formed by producer Manolo Bolognini with the purpose of ripping off the successful films of the duo Bud Spencer-Terence Hill.
Terror Express (Italian: "La ragazza del vagone letto" , lit.
 "The girl in the sleeping car") is a 1979 crime film directed by Ferdinando Baldi and starring Silvia Dionisio.
Texas, Adios (Italian: "Texas, addio") is a 1966 Italian Spaghetti Western film directed by Ferdinando Baldi and starring Franco Nero.
 It is often referenced in connection with "Django", also starring Nero, and although was referred to as "Django 2" in some countries, it is not considered a sequel.
 The film is mostly remembered as a lesser known Spaghetti Western.
Long Lasting Days (Italian: "Una vita lunga un giorno" ) is a 1973 Italian crime drama film written and directed by Ferdinando Baldi and starring Mino Reitano.
Io non protesto, io amo (Italian for "I don't protest, I love") is a 1967 Italian musicarello film written and directed by Ferdinando Baldi and starring Caterina Caselli and Terence Hill (here credited as Mario Girotti).
Carambola's Philosophy: In the Right Pocket (Italian: "Carambola, filotto... tutti in buca" , also known as "The Crazy Adventures of Len and Coby" and "Trinity and Carambola") is a 1975 Italian comedic Spaghetti Western film co-written and directed by Ferdinando Baldi and starring starring the duo Michael Coby and Paul L. Smith.
 It is the sequel of "Carambola!
".
Spaghetti Western, also known as Italian Western or Macaroni Western (primarily in Japan), is a broad subgenre of Western films that emerged in the mid-1960s in the wake of Sergio Leone's film-making style and international box-office success.
 The term was used by American critics and other countries because most of these Westerns were produced and directed by Italians.
Detective Belli (Italian: Un Detective ) is a 1969 Italian crime film directed by Romolo Guerrieri and starring Franco Nero.
 The 1973 sequel, also starring Nero is entitled "La polizia incrimina la legge assolve" the English title was "Streets of Eternity"
Ten Zan: The Ultimate Mission (aka Missione Finale) is a 1988 North Korean-Italian science fiction action film directed by Ferdinando Baldi and Pak Jong-ju under the pseudonym "Ted Kaplan".
 The spy film was made in English language, and shot in North Korea using Western actors.
 The film portrays North Korea as a kind of futuristic society, a decision which Baldi later explained as "a conscious avoidance of reality".