I believe my cat is atleast part Russian Gray, do you think so?

He is a completely grey cat with pretty green eyes but has these stripes when the sun hits him just right; I thought I was imagining it when I first noticed it last year (he is approx 4 years old and I got him from someone when he was approx 1 1/2 yrs. old who was moving into a small apartment and could not take him).....he also has a very small splatch of white under his neck...very small. If you did not see him in the sun and catch his coat just right......you would think.......as I thought, that he was a solid grey...........he's beautiful and mysterious looking........wish I had a pick...but I get cat fancy magazine and this months edition featured russian grays......I also went online to see pics.........and he looks exactly like them only there is a little tuft of white under his neck...........and at age 4 would you still be able to see his "ghost stripes."