They are Cerianis, well the bottoms definately are.
I have had more sets that I would like to ever admit to and have never seen a set with the knurling on the leg like that.
That said I am still learning, so never say never.
Bultaco (Betors) had them with a knurled leg to grip in the lower yoke.
The Ceriani damper bush and assembly will go in the bottom of a Betor leg (same dimensions) so it is possible that the original Ceriani tubes may have expired and been replaced with Bultaco (Betor) tubes.
The threads on the Ceriani legs (3 types) are all different to the Betor thread pitch, so if you used Betor tubes, you couldnt ahve used the Ceriani nuts.
And... looking at the top nuts they look very Betor rather than Ceriani. What thread pitch do they have as this will give it away.
Wow how sad am I ??!!!
The dust seal covers are wrong (I have NOS correct ones), seals (but the bucket load) and the correct decals for the bottom of the slider (and tubes, dampers, springs etc) so all thiose bases are covered.
All you need to do provide the spit and polish!
They will look beautiful when polished.
Not that any of this matters, they are a nice looking set of forks and with a service will work very nicely.
Hope this helps