For me using the word "transitional" on its own describes a 145.022-68 or 69 with a 321 style dial.
Of course the word can be used in other circumstances, but to do so in Speedmasters can lead to confusion. I think most think of a "Transitional" as a watch with three characteristics : AML dial, low serial number, DO90 bezel.
Some describe the 105.002 as a transitional, as a transitional model between 2998 and 105.003 (something I personaly do not subscribe to)
The straight writing engraved caseback on the 145.022 between the -69 smooth back and the stamped caseback is also refered to as a "transitional back model", a phrase I do use as it readily describes the piece.
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