I know the stamp looks like a 4 cent denomination, but the cross line on the 1 is from a cancelation strike from a post office, the stamp is truly a 1 Cent stamp if you compare the depth of the four cent stamp you will see what I mean
No - yours is nowhere near the Prussian blue, if you look at the France Timbres image and the image from the Hermione sale in the thread that Rod linked to, you'll see the distinctive colour.
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