A great little history Scott!
specially for a last minute collector like me,
for me it's all new and a thing like this it's a little discovery,
I was searching an insert like these
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creditis d.devos
and found yours, with a little bit unclear pic :D
so that's why I take this and I'm now I'm really happy of this variant,
speaking about the use I work with the bikes and all the time of the champions are different for only few cents or decimal part of second so for sure this cale it used also in the racing sphere