Stunning yellow against the blue sky.
As for Daffodil in the Cattleya alliance, things are not that easy:
In 1907 a Lc. today C. Daffodil was registered for Armstrong/Brown as a cross between Mercia and jongheana. Mercia is schroederae x crispata, eventally using the yellow form of Laelia crispata.
In 1940 a Rhyncholaeliocattleya Daffodil was registered for Sladden as a cross between Irma and Trimabilis.
In 1949 Rhynchanthe Daffodil was registered for Fennell as a primary hybrid between Rhyncholaelia glauca and Cattleya/Guarianthe aurantiaca, eventually using the yellow form of Guarianthe aurantiaca.
I think this is the one above that flowered 6 weeks ago.
For anyone interested here is a link to my Daffodil:
Rhyncholaeliocattleya Daffodil
Things are getting more comlicated as today Brassavola is Rhyncholaelia, some Cattleyas were transferred to Guarianthe, Laelia turned into Cattleya and so on.
Sorry, I can't help you to identify the Cattleya in question.