I would appreciate thoughts on the authenticity of this coin. It appears to be a Hartil 6.1 with a diameter of 41.2 mm and a weight of 12.8 grams. Both, I understand, within the parameters of a coin of this time period. It has been in my collection for quite a number of years having bought it from a reputable dealer in Hong Kong. Do you think I have a reproduction or.....?
On another respected coin forum reactions were mixed.

