If the doubling is only on IGWT it may be master die doubling. In that case (quite common in 1972) the doubling is on the master hub. Every working die has the doubling so there is no premium. I have been fooled before on this. Read this at the bottom he discusses the 1972 http://www.doubleddie.com/203801.html
I wonder about the word GOD though. I have not seen anything quite like mine. Have you seen anything like it? Just curious. It probably is a common one though.