Here are two examples from the large hoard of stamps I just
inherited. Scott 245 is the 2 cent King George VI, part of the 1938 Royal Family Issue. The first example has a pretty clear crack between the two stamp, above the F and all the way to the second N in Foundland.

My second copy is damaged and wasn't quite clear at first, due to the placement of the perforations:

But then I noticed the distinguishing features, circled in Black in the examples below. (The red circle is the cracked plate, which is hidden by the perforations in the second example.)


Does anyone know if this is a known variety, and the value (if any)? Thanks in advance.