C Walkerinter x C Angelwalker, as best as I could determine, is an unregistered cross. C Walkerinter is the primary hybrid C walkeriana x C intermedia. C Angelwalker is the hybrid C Little Angel x C walkeriana. If you figure it out, this cross is C walkeriana-50%; C intermedia-25%; C loddigesii-19%; C dolosa-6%.
A search here on OB found a pic for C Walkerinter from pheli that had purple/pink streaks of color in the petals/sepal and a purple/pink lip. Can't find any pics of C Angelwalker.
I purchased this plant from Rob at Little Frog Farms earlier this month. I potted it in fir bark in a 6" clay pot. It has 12 p-bulbs and 2 flowers. The flowers are completely white with a 4" ns. The flowers just started to open today and I expect will flatten out some more.
I did not detect any fragrance, which is unexpected given the walkeriana background.
Angelwalker is usually seen in white and looks much like walkeriana. The cross with Walkerinter does appear to be unregistered. You might get some scent developing when the flowers mature in a couple days.
Your flowers are a nice size for the plant but seem to be a little blah, more like an average loddigesii alba than an improved walkeriana type that I assume was the goal for the cross. Still, it is nicely balanced and gracefully proprotioned. If it grows well and blooms easily it could certainly earn a place in my collection.
Many of these have been pink... That is the first white one I've seen, which is odd, because I was expecting them all to be white.
AFIK, the cross was made by a company that is now defunct (that is how I got them). If you wanted to register that cross, I guess you can go ahead and do it.