Its hard to say. By regulation an enlisted man could have regiment and company on his hat, though most seem to only have the regiment, It probably depended on what was available. In one of my books there is a picture of 2 privates, both wearing the 1874 pattern piped 5 button field blouse, and on their 1872 pattern forage caps are clearly both regiment and company. In fact, most pictures of Officers only show the regimental number, which makes sense if you think about it, as the officers would identify with the regiment as a whole, with the enlisted men more identified by their companys.