ISO Equivalent on 100B

Sorry if this has already been covered,
But does anybody know the ISO for the 100B, I am trying to set up some lights and realized that i had no idea, Am using a L358 light meter
Thanks
Kris
 
I think the A is 320.

Probably B would be the same. ... though, I might even be wrong on that. But I'm pretty sure a DP told me that at one point.
 
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