You just have good luck. don't you?
When you go to remove the understock, take a scion and graft it as well so you can have two excellent plants!

Cheers,
-Sam

Not sure what 'Kandinka' will do, but the yellow spring Norway is an actual unique real tree, top to roots. If you think it is above average and unique, keep the one of a kind tree. They can always make more grafted oddities (thou it may not be easy to find).

I like both! Can you tell us more about Kandinka?

On a related topic. It is known that understock can influence the growth of the scion. Does it ever work in reverse? That is, can a scion influence the growth of the understock?

Sam, sometimes I've luck finding new conifers ;0)
If this understock was used for a faster growing Picea cultivar, it was cut off before Winter so it never had the chance to show it's golden Spring growth...
This understock will accompany the 'Kandinka' till I've propagated in a nice amound of young plants. Comming Winter the first graftings will be made, at least 8 scions are availlable which is a good start!

Noki, this yellow flush Picea abies is a one of a kind tree which can be propagated faster in a bigger amound then the 'Kandinka'.
I think in 3 years I'll cut off the understock so the 'Kandinka' can grow "free"...

Nate, I also like both ;0)
The 'Kandinka' is a Picea obovata witches' broom which was found in Russia.
This plant derives as a scion which came directly from the original broom.
In my opinion the scion doesn't have any influence to the growth of the understock, at least I never came across such a situation...