I now think this is a Galli Ritmo, a Galli Competitizione enjoying the dubious benefits of downwards ‘range extension’. In a crucial signal to consumers of the time, the hanger bolt has a hex head rather than an allen key socket. This probably halved the selling price - although how it had any substantial effect on the production cost remains something of a mystery.

In terms of the variables that seem to define Galli models, this silver example has:

• a hex-head hanger bolt,
• a b-knuckle with a small reinforcing 'gusset' under the cable outer stop,
• an outer parallelogram plate with 'big dots' surrounding the logo, and a low-mounted cable clamp arm, giving a low actuation ratio,
• a curvaceous pulley cage,
• Simplex pulley wheels,
• a hex-head cable clamp bolt.

• Derailleur brands: Galli
• Country: Italy
• Date of introduction: 1980?
• Date of this example: unknown
• Model no.: unknown
• Weight: 200g
• Maximum cog: 26 teeth (Sutherland’s 4th edition)
• Total capacity: 20 teeth (Sutherland’s 4th edition)
• Pulley centre to centre: 45mm
• Index compatibility: friction
• Chain width: 3/32”
• Logic: top normal
• B pivot: unsprung
• P pivot: sprung
• Materials: aluminium