Mint nh e 15a plate block plate# 19280 gem price on sleeve says 600 but idn who or. When priced it

Mint never hinged. And gum is perfect gem quality e15a plate block plate#19280 red ink in a old Heco sleeve for protection it says value in 600 dallors ill send best pic i got on my phone can u plz tell me close by lookin at pic what there worth or how to come up with value plz look at um and tell me what u think and what u know about them thanks
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