I dont think anyone is gonna be able to help you out without better pics and close ups of the areas youre talking about and a description of what it is you think you are seeing
I think you mean FG initials on the reverse? They are there but faint,a Grease Filled Die maybe.Might be a floating roof also but can't tell. Need better pics to tell if it is a doubled die.Seems to be fingerprints on it as well. John1
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