I have seen this for sale in those ill-reputable magazines and used to be quite a popular one to sell.
I think the coloring would vary, be richer after more established. There is no way to know what yours is, unless you find a list, and old catalog, remember where you got it ect.
You can try purchasing some guesses and growing them next to it, that is the only way.
Daylily (Hemerocallis 'Northport')
