How To Use A Colour Key: The Rare Prussian Blue | Stanley Gibbons

Colour identification in philately can be a difficult task, but it can make a huge difference when identifying your stamp and its value. Oscar Young, a professional philatelist, uses the rare Prussian Blue as an example on the colour chart.

Shop the Stanley Gibbons Colour Key: https://bit.ly/3BZsHDT
This rare Prussian Blue stamp will be part of our upcoming November Auction: https://bit.ly/3dXnv8N

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