Japanese kanji vs Chinese characters

I was going through my receipts from Tokyo tonight. I found this mysterious receipt from 領収証書 which had a line item for 70円普通切手. I couldn't figure out what this 切手 was. It means "cut hand" in Chinese, but thanks to my new Besta CD-863 electronic dictionary with 13 languages, I eventually figured out that 切手 means postage stamp in Japanese!