Really not much to say. The Penciled (pn) gene is one of those incomplete recessive genes like the Red (r) gene meaning that a single copy of the gene can have a partial effect on the visible coloring.
There has been speculation that the Penciled gene is linked to the Black Winged Bronze (b1) gene.
With Porter bringing back the Recessive Slate turkeys, it may indicate that the Penciled gene is not linked to the Black Winged Bronze gene since the Recessive Slates are Penciled but do not have the Black Winged Bronze gene. It is also interesting that even though the
Recessive Slates are said to be Penciled that they are not claiming that it has a Penciled gene.
Based on the b1b1 Ccg Rr Pnpn speculation of the OP, the poult is a Semi-Penciled Harvest Gold. If it turns out to be pnpn, it will be a Penciled Harvest Gold.