"I found in the attic of his grandfather the coin" Do not be angry,but it's a most common story when somebody try to "push forward" a fake If it's really so happened and the coin isn't a fake,the coin may worth about 1500 greens,in this condition. However needs more good pics and do not forget a pics of edge. What's about weight?
Weight - 8.6 g From what I know this grandfather had a little different gold coins, in times of crisis sold them, this coin found in old clothes in the attic of his grandfather. (Grandfather died last year) also I found many souvenirs from the period of WW II
Weight is good! The most important good photos,without a capsule,and photos of an edge too. At best to send the coin to NGC,russians buyers(if you wanna sale it in the future) like better NGC then PCGS