180th Anniversary of the Penny Black Stamp. 2020 Proof Sterling Silver 50p. The item "180th Anniversary of the Penny Black Stamp 2020 Proof Sterling Silver 50p" is in sale since Wednesday, December 30, 2020. This item is in the category "Coins\Bullion/Bars\Gold Bullion\Coins". The seller is "2010keithr21" and is located in Newark, Nottinghamshire.This item can be shipped worldwide.