Just to clarify your model numbers, it's 7OT, as in 7-Old Timer.
I can't answer your production year question off-hand, but the information might be here in the forum already.
The 7OT is not rare; it was mass-produced for many years.
The 89OT I would classify as "less common." It's hard to call almost any Old Timer "rare" since every standard model was produced by the thousands, or tens-of-thousands, or hundreds-of-thousands.
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