Sorry !! Just saw this !! When you answer in a comment,,we are not notified nor does it show on the post other than the “like” box !! This site still has some kinks to work out !! It was just recently updated !! Always post to reply and then I can see it as a recent post !!
If they were mine,, I would list them on ebay at $5.00 each and just see where it goes !! If they do not sell consider reducing that price !! Usually blue and white tiles do well !!

http://wellstile.com/catalog/tag/american-encaustic-tiling/

You can see some of their tiles here !! They made many types of art tiles !! Your tiles were made to compete with the Delft tiles which were popular at the time !! Yes you can probably sell them on ebay as Delft style tiles !!The company was in business from 1875 to 1935,,these could have been made any time within those years !!