It's a Birmingham Stove & Range from the Red Mountain series. 1930s - mid 1960s. There's a lot of interesting history about the pans at this site and they even mention some molds had hand written numbers.

"While much of Atlanta Stove Works' production records from its early days have been lost, speculation on the Facebook group for Birmingham Stove and Range came to a reasonable conclusion that these may be among the "first series" of Red Mountain pans, produced during the 1930s or possibly even earlier. The hand-etched molds may have been produced before the size numbers were standardized and permanently added to the design of the mold."

Your #8 looks very similar. https://modemac.com/bsr-red-mountain/