Thanks for all your replies.
We purchased our property as a daylily "farm" in 2015 with over 400 varieties.
The owner before us had nametagged "some" of them, not all.
We are coming into summer here, and we're in full bloom. As we've divided the fans in the past, we've potted only some of them and transplanted most. Meaning that this one in a pot would have come from an in-ground plant at some point. But I can't find it blooming in the garden... yet. I hope it blooms soon so I can see how much of it I have.
Every morning at the moment, I am out photographing new blooms and creating a database. I am finding old tags with the names of plant that were here at some point. Over the years it appears that tags have become separated from their plants, so I am trying to make some sense of it all. ie. making a list of the tags I have found, googling them to see if they match up to a nametag I have found. Long tedious job.
This one is not flowering at present, but when it does I will take some measurements and take more photos.
Thanks again for your help