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frankenbike-
Nope...
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I thought the 68/73 switchover occurred in the 90s
There was no "switch-over", both widths have always existed side by side since 73mm first arrived. The question is moot, since Shimano HT2 MTB cranksets will work with either, they just use a 2.5mm spacer each side between the cups and the shell for 68mm and omit them for 73mm.
coventry_eagle
gbj_tester
@frankenbike
What width do you suppose the BB shell is going to be?