You can still buy quarry's at CTD Tom,They look like red quarry tiles but as you are in the USA my knowledge of manufacturers in the states is limited.
In the UK, these would have been made by Denis Ruabon, Daniel Platt or Shaws to name but a few.
Unfortunately, quarry tiles like these are rare and very difficult to purchase.
Thanks Jim! Do you know if there’s a way to get the black stains out?if those tiles were laid in the 40s they are most likely fixed with cement mortar in that case you might not be able to reclaim them.