Someone in advertising Model 28 (and 35 but they will have gone I think) on the Facebook Vintage Computer Club group:-

https://www.facebook.com/groups/118582384841803/

the 5-level machines are:-

TT Model 28 ASR (3 of these)

TT Model 28 KSR (2 of these)

TT Model 28 RO (2 of these)

Extra Model 28 Parts

TT Model 28 Floor Standing Paper Punch

TT Model 32 Baudot

Dave

G4UGM