Bulbs: Looking for Daffodil ID, 1 by gemini_sage

gemini_sage wrote:
I've had this triandrus Daffodil for over 20 years, originally from Dutch Gardens, and can't recall the name or find it in any searches. The characteristic I thought would make it easier to find is that it has doubled cups. I've had it in my mind for a long time that it is a sport of Thalia, but I can't recall where I read that. Any help in IDing it would be greatly appreciated.

Some blooms have more doubling in the cups than others, as you can hopefully see in the pic. I have a tough time capturing white blooms in pics, usually either sun or the flash bleaches out the shot, but some detail shows in this one.