martinboyanov83, it appears to me that you are new to identifying Washington/Franklins of the 1908 series. The first step in identification of them is perforation measurement.
https://www.stampcommunity.org/topi...42770#366891Follow that link to find a discussion that details how to count the perfs of an image as well as the best starting method where you can print a perf gauge for free. Start with the printable gauge, you can work on counting perfs of an image later.
Eventually, if you have an interest in learning the Washinton/Franklins, then buying a manufactured perforation gauge is ideal. Until then, the printable gauge will suffice.
The next thing that you need to learn is how to determine whether you have a flat plate, rotary, or offset printed stamp. Follow this link and read it to learn how to differentiate them:
https://www.stampcommunity.org/topi...40718#349013Once you learn those topics, then you can apply your knowledge to identify all of the Washington/Franklins. The last thing that you will need to learn is how to identify watermarks.
http://www.stampsmarter.com/1847usa/Watermarks.htm is a good starting point.
None of this is intuitive. You will find yourself stuck at times uncertain of what you just read. That is normal and that is the point where you should post again in this thread looking for better explanations. I and others will gladly help you.
The methods of identifying the Washington/Franklins takes some time to learn, but it is possible for everyone that has a few hours to read the information and those who ask for clarification of topics that they have a difficult time understanding.
I encourage you to learn the methods and I will gladly help you to understand any part that you have difficulty with. Others will also be willing to help you learn them. Please post your questions. I and others truly enjoy teaching others.
If you only have a passing interest in them, then post large and detailed scans with a dark background that allows us to easily see the perforations. I encourage you to learn the identification of them, but I will help you identify your stamps even if you don't wish to focus on collecting them. That is very understandable if you only have a small amount of them and they are not something that you desire to focus on. Please let us know what your intentions are so we can best help you to learn or help you with identification of the small amount that you have.