These US models used this pattern & this knob looks surprisingly like the one in the picture.
I would be inclined to speak in very reverent tones to some of our US members to see if it was possible to source one from there.
I was extraordinarily fortunate to learn of this one & to discover that it was available, but if you don't ask, no-one knows that you are looking for these things.
As for a part number, ... No, I do not know it.
David, thank you for allowing me to hijack your image, I hope. [I haven't asked him yet]