The Shimano Altus derailleurs and shifters were manufactured in the late 70s and early 80s, serving as lower high-level components comparable to today’s 105 or Tiagra series. I personally used this group on my 1981 Schwinn Super Le Tour.
Rear Derailleur
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Capacity: Front Difference – 13 teeth, Rear Largest Sprocket – 28 teeth
Weight: 262 grams
Material: light alloy/steel
Front Derailleur
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Capacity: 14 Teeth
Weight: 122 Grams
Material: light alloy/steel
Down Tube Shifters
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Type: Friction
Weight: 85 grams
Material: light alloy/steel