I' ve finished some exploration and my ultimate guess is Chartreux because the eyes are golden, not green similar to a Russian Blue, but he just isn't Fats faced just like a Beitish blue and much too huge for being a Korat. But Certainly, your cat is definitely the doppelganger https://accidentliabilitysupport56542.blogolize.com/details-fiction-and-british-shorthair-74586004