Are these the very best tulips?

[MrsBertBibby]

These tulips came with the house, 7 years on they are still flourishing, even spreading. They come up yellow, as in first pic, then get a red margin, which slowly spreads until the flowers are completely red.

Never seen them for sale, dies anyone recognise them?

@zebette no, not ballerina, I have dozens of that, it's my favourite tulip☺️ and it's more orange. These start off a pure bright lemon yellow - and looking at them now, the orange flush had faded to a pinky colour but the centre is still lemon, here with Mariette.