Sun-yat Sen ...what's the deal?

in Stamps Forum
Okay folks...I give!..this is about as confusing as it gets for newbie..one auction says this 13c with red 20 over mark sold for $1500 in October...but I saw it on eBay for less than $10..what kinda shenanigans is this?..am I just missing something?..
please advise me on this kinda deal..
Thx for your time
Oh yeah..I also have these others
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Comments
Is the eBay one real? Have you confirmed that one actually sold for $1500?
In any case, yours are not the same so those other answers don't apply. (Yours could be common, or rarer than the red overprint - I have no idea). If you are looking to sell, contact a major stamp auction house and they will take it from there.