https://data.fitzmuseum.cam.ac.uk/id/object/196949
The Fitzwilliam Museum - 10 groszy: CM.847-2012
A record for a Fitzwilliam Museum object: 10 groszy CM.847-2012
the fitzwilliam museumcm
https://worldcoinnews.blogspot.com/2014/03/poland-1-2-and-5-groszy-2013-new-design.html
World Coin News: Poland 1, 2 and 5 groszy 2013 - New design and composition
The aim of this BLOG is to inform about the releases of New World Coin types. Will try to post information about official, legal tender coins only
world coin news
https://data.fitzmuseum.cam.ac.uk/id/object/301673
The Fitzwilliam Museum - Polish 10 groszy, 2017: CM.72-2019
A record for a Fitzwilliam Museum object: 10 groszy CM.72-2019
the fitzwilliam museumpolishcm