Known TI models with key bounce issue?

[Accutron]

Key bounce is endemic to all TI handhelds from the mid-1970s through the early 1980s. Of the models you listed, the only two that I own are the 1250 and 1450, but they both can bounce or miss keystrokes. Other models from that era which I can confirm have bounce problems include the TI-1200, TI-30, TI-51-II, TI-55, TI-57, TI-58, Business Analyst, BA-II, TI-1030, TI-35, TI-30-II and BA-35. The rule of thumb is, if it has the TI logo, it can have bounce problems.

You might have better luck with an older TI machine like the Datamath, which has a Klixon keyboard.