Three VFNH examples of the 4d multicoloured 1970 Christmas issue, with two showing interesting downward and rightward shifts of the gold framem revealing the dark brown frames underneath. Normally the gold is printed on top of the dark brown, so that all that is visible is a deep gold frame. The shifts cause the dark brown frames to become visible.
Gibbons does not list colour shifts, but our estimate for these is $3.
