I can't help with the plate number, but I'm sure one of the others can. As to value, your copy is almost identical to mine, right down to the margins and the red Maltese Cross postmark and I paid about $300 for mine. Also, SoR has a page called The Penny Page and your "PJ" is not there. That's something you should probably do - one closer to having a whole sheet. I don't officially collect GB, but I think every serious collector should have a Penny Black!!

 
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