I don't think any of these are particularly rare or unique, at least in Europe. I see things like this often at fleemarkets. Where do you live? Did these belong to your grandfather because he had a connection to the Soviet Union, or did he just collect them because they were interesting? If it is the former, I'd recommend keeping them even if you have no interest in them. This part of your family history is something worth holding on to, and will likely be interesting to someone else in your family someday. If they're just things he collected, I suppose I would first offer them to other family members who might be interested. Otherwise I'm sure there are people on ebay who would want them, or (depending on where you live) a military surplus store might be more than willing to take them.