Fii;. 1411, — X-RA\-B.\cK-REFrECTiON [Jattcrns of 

 l«n i^old coins, serving to distinguish between 

 a genuine struck coin (left) and a eounterfeii 

 cast piece (right). 



I'ig. K57. — Reconstruction of Leonardo da 

 Vinci's coin stamper. 



PAPER 31 : HISTORY OF THE NATIONAL NUMISMATIC COLLECTIONS 



