ID Help

I'm just curious for future reference, this pan looks BSR red mountain to me, however everyone I've seen had the mold letter next to the number, not below it, handle has me thinking BSR, anyone know for sure?
https://imgur.com/a/tcxOP

This one also looked BSR to me, but again the mold mark, or lack thereof is throwing me off again, BSR?
https://imgur.com/a/aPVi1

The letter is called a pattern letter. BSR wasn't terribly consistent with the placement. The lack of a letter just meant there could be one more working pattern. I'd say your #10 is post-automation, likely to have been sold as Century as not.

Thanks Doug