Specimen stamp

A specimen stamp is a special stamp that is used for showing what a stamp looks like without actually using it. It's kind of like a pretend stamp that is just used for show and tell. You can't use it to mail a letter or anything like that, but it's still important because it helps people know what the real stamp looks like. This way, they can recognize it when they see it on an envelope and know that it is a valid stamp they can use to send a letter or package. So, think of it like a pretend version of a real stamp that helps people know what to look for.