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I looked at this a bit, a search in VRF or TRF/Vintage for IIII finds a few mentions. (Humorously, both the IIII and the IV have been explained on the basis of “balance” or “symmetry.”)
I don’t know any certain answer, but certainly >95% of the 5-digit DD dials I’ve seen have IIII. If you don’t get a reliable answer here, it might be worth asking in Vintage forum.
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