The Transitional is a cal 910 in a 145.026 case, in fact. The transitional dial has a different font on the subdial at 9 :
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It was a 145.013 dial where they removed the green paint and printed the running seconds track instead (left). I have an example of extract of archives mentioning a cal 910 in a 145.026 case, with that transitional dial, to confirm that theory.
The other way around doesn’t make any sense to me. Why would a 145.026 movement/dial be fitted in an early case else than a custom build ? What do the Archives say?
Look forward to see your shade of transitional anyways
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