There is only revision A and Z listed, not B. But it seems you are right and the first part is quite old. I will simply replace it in my bom.Thank you!
https://eu.mouser.com/Search/Refine?Keyword=stm32f100rbt6There is no mouser part no and they don't have it on stock. It must be really an old part. I will simply replace it in my bom.
