Thanks Adrian. Just when you think there is something definite! 
 
Interesting that the GR was still being used right through William's reign and into Victoria's. 
I know carving out the mirror image cypher onto a steel punch to form the stamp must have required a large amount of skill. There is a Victoria cypher which has been made by removing part of the W from a William cypher. I'll look out the pictures. 
Tends to support the theory that it took awhile for new stamps to get made.
		 
		
		
		
		
		
		
		
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