I am slightly confused about this Shimano Titlist. As I remember it, as the 600 series became more sophisticated - with the launch of the 600 EX (6200) and then the New 600 EX (6207) - the old 6100 design was resuscitated and relabelled as this Titlist.

This example is a short pulley cage version, and the labelling aside, it is exactly identical to the 6100 series of Shimano 600.

• Derailleur brands: Shimano
• Categories: Shimano - the Ultegra story, Shimano - the Deore XT story
• Country: Japan
• Date of introduction: 1977?
• Date of this example: 1980 (two letter date code is EB)
• Model no.: DB600
• Weight: 231g
• Maximum cog: 28 teeth
• Total capacity: 28 teeth
• Pulley centre to centre: 46mm
• Index compatibility: friction
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: largely aluminium, steel pulley cage plates