There's a hinge mark on the 3 sen stamp. Please be aware of all the details. The 1.5 sen and 3 sen stamps are genuine. Regarding the 10 sen, the Imperial Crown... Well, the color seems a bit less blue. I thought it was a bit bluer... This one is rather dark, so I checked the back! I see. It says "reproduction" (模刻) lol Reproduction, sample, In short, it's a look-alike of the Imperial Crown. It's actually quite beautiful, so how about using it as a sample? Both sides are genuine lol Thank you very much. m(_ _)m