Your seal should belong to "signature seal". There is no postmark on a stamp, so it cannot be called a "first day cover". It seems to be a "commemorative stamp" in the lower left corner, but I can't see the date (I wonder if there is a date). Is the design on the seal printed? Does it look like the scenery of Tiantai Mountain? If so, it is still sealed in place. But the strange thing is, how can the signature on the seal have two "Nie Weiping"? Did he sign it twice? This is unreasonable! At present, seals are relatively unpopular and marginalized in the philatelic market, and the price of general seals is relatively low. Such a "signature seal" is only interested in people who collect it specially, so there are fewer people who collect it. Only when you meet such a person will you show your value. The so-called value is the signature of those celebrities. I think, if you like it, give it dozens of yuan, and if you don't like it, just a few yuan.