Can anyone identify this?

[Slava]

I'm not a big specialist about insignas but that tree tells me nothing.
As far as I know there were not many cab and other marks painted on WW2 time Russian tactical vehicles.
The link to the GAZ pick-up might be used as a good source.
I know those guys who made that restoration, they are too pidantic and usually do perfect job. Shure they worked over as much info sources as they could and got good amount of spares preparing to the project.
I need to add it's too rare vehicle nowadays.
Vlad.