A regular-sized 切手 is kitte, a postage stamp!
By the way, even a “small stamp” (that is, a 小切手) can be huge. Look at this monstrously long compound:
給料支払小切手
We’ve just seen all these kanji, so here’s a second quick quiz. See if you can figure out the yomi! Guess at the meaning, too!
Answer to the Second Quick Quiz …