IBM Wheel Writer 30 & Lexmark Personal Wheel Writer 25- The IBM 30 & PW 25 both have only one green coded key ("RMar IndR") on the left side. The only difference between the two models is that the PW 25 has a straight-edged base and the IBM 30 has a notched base.

 

IBM Wheel Writer 35 & Lexmark 3500- These two model has a green coded "Menu 2" key.

 

IBM Wheel Writer 50 & Lexmark 5000- These two models have a green coded "Delay Print" on the "Menu" key.

 

IBM Wheel Writer 70 & Lexmark Wheel Writer 7000- These two models have a "Help" control key. All of the control keys on the left side have F-1 through F-10 on the front of each of the keycaps.

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