Just received these today. I've been a collector of the 1865-73 Nevada Documentary revenues as well as the California series from about the same time, for several years now. The initial stamps were imperforate, but starting about 1867 roulettes were issued. Quite a few roulettes were sold as remainders apparently, as mint stamps can be found surprisingly easily. Not all are easy however, and the first stamp in this group is a single star pale orange of 1868, rouletted 18x15. Seems like the compound roulettes are more dIfficult to find than the later roulette 10s, like the rest of this group. I found these on eBay
On these and first issue US revenues I've begun seeking out cancels from Comstock Lode mining companies. I'll post some of those next. Feel free to add yours.