Have you produced tolbunt or do you know of any one that has produced tobunt by the following:
Pied bird(like in exchequer) X gold laced or spangled = F1
Backcross F1 X pied bird = BC1 (? tolbunt) + hybrids
BC1 x BC1= BC2 ( tolbunt ) + others
I have two Orp wannabes with poor lacing & mottles, but they more happened tahn were deliberate; probably shan't continue as I'm thinking of dropping Orps.
I have only ever seen tollbunte Polands in photos.
Many in the photos look reasonably well laced with mottles at the feather tips, like these:
http://www.kuifhoenderclub.nl/page_ned/nieuws.htm
But some look totally haphazard. I think they're probably just incorrectly marked.....but I could be wrong.
I think the general idea is supposed to be ER/ER, Co/Co, Db-Ml-Pg/Db-Ml-Pg, mo/mo. However some look quite a long way from that & probably are het for some of the genes. I think they're probably just incorrectly marked.....but I could be wrong.
If setting about making tolbunt from scratch I'd use mille fleur on goldlaced. Theoretically it would be possible to get some tolbunt from F1XF1 but it would probably be easier to use closest of the F2 with mottling X to gold laced & repeat.
When you say pied like exchequer, do you mean black based extreme mottling?