Is your Penny Black worth £300,000? | You've heard of the Penny black, you might even have one in your collection… but did you know that a plate block of Penny Blacks
![Grossbritannien gestempelt - 1840 One Penny Black, - Briefmarken 2018/10/30 - Realized price: EUR 260 - Dorotheum Grossbritannien gestempelt - 1840 One Penny Black, - Briefmarken 2018/10/30 - Realized price: EUR 260 - Dorotheum](https://www.dorotheum.com/fileadmin/lot-images/43S181030/normal/grossbritannien-gestempelt-1840-one-penny-black-6012033.jpg)
Grossbritannien gestempelt - 1840 One Penny Black, - Briefmarken 2018/10/30 - Realized price: EUR 260 - Dorotheum
![World's first postage stamp the Penny Black could fetch whopping £6million at auction - Mirror Online World's first postage stamp the Penny Black could fetch whopping £6million at auction - Mirror Online](https://i2-prod.mirror.co.uk/incoming/article25304429.ece/ALTERNATES/s615b/0_HONG-KONG-ART-AUCTION-SOTHEBYS.jpg)