The Shimano Altus derailleurs and shifters have been made within the late 70s and early 80s. They have been decrease high-level elements that may evaluate to at present 105 or Tiagra. I had this group on my 1981 Schwinn Tremendous Le Tour.
Rear Dearailleur
Capability: Entrance Distinction – 13 tooth, Rear Largest Sprocket – 28 tooth
Weight: 262 grams
Materials: mild alloy/metal
Entrance Derailleur
Capability: 14 Enamel
Weight: 122 Grams
Materials: mild alloy/metal
Down Tube Shifters
Kind: Friction
Weight: 85 grams
Materials: mild alloy/metal