Market Model Name/Feature Code
Model M6-1/ThinkPad UltraNav Keyboard
IBM ThinkPad scissor-stabilised rubber domes (LITE-ON variant)
Generic IBM logo, Old Lenovo logo
Dual-setting flip-out feet
Black straight fixed Type A USB
Synaptics TouchStyk & TrackPad UltraNav
Has an integrated two-port USB hub, also branded as either Lenovo USB Keyboard with UltraNav, Lenovo UltraNav Fullsize USB Keyboard (Japan only) or Lenovo ThinkPad Full-Size UltraNav USB Keyboard since 2005, exclusively branded as a Lenovo product from October 2014, alternative FRU number is 41A5156
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More about this type of keyboard...
The Model M6-1 UltraNav keyboards were an extension of the standard Model M6-1 keyboard that included a trackpad and only used TrackPoint IV. Keyboards such as the IBM SK-8835, SK-8840, and SK-8845 were also the first desktop implementations of a ThinkPad keyboard. Integrated examples of these UltraNav keyboards were largely produced by either Alps or NMB, with desktop keyboards exclusively produced by LITE-ON.