I have this special Model 28 base that I don't have the time to work to restore. Please see the pictures attached to see a Teletype Model 28C Base that includes both a three-speed gearshift and an answerback.

What is missing:

1. the LMU. 2. gear # 162669 3. at least one spring. 4. one vacuum tube

The pinion gear 162669 is generally considered to be made of unobtanium but I do have the specs:

24 D.P. 14 1/2 P.A. 15 teeth 11/32 pitch circle Face width 1/2" Hub length 5/8" Hub diameter 1/2" Hub bore 3/8"

Let me know at wa3frp@gmail.com if you are interested.

Thanks 73

Russ