'I have a little pin that says..' Is this literal or metaphorical

Is the sentence :

“I have a little pin that says I didn't miss school for nine years.”

to be taken as being metaphorical, that I unnderstand the sentence to say something like “I am quite sure of the fact that I haven't missed school for nine years ...”, or am I supposed to take this sentence literally, that this person actually received a little pin, maybe to put on his clothing, on which is printed (in small font) that he didn’t miss school for nine years?

It is called a "perfect attendance" pin. If this was spoken in English it could, indeed, be literally true. These were more common 50 years go than they are today.

Google will show you many pictures of these pins.