We have a mystery skillet! The seller told us that this was a Blacklock, but the numbers don't look like the Blacklocks we've seen. I reviewed the page on identfying unmarked cast iron and either missed something or didn't find info there. Anyone out there able to help? Thanks!
https://imgur.com/n3veOtq
https://imgur.com/oA9lues
https://imgur.com/n3veOtq
https://imgur.com/oA9lues