"Acme" bookstamp

Only available from books purchased from Goliath, this cheery birthday stamp (don't ask why I do this; I'm clearly a frustrated librarian) is for people asking for birthday greetings in their book. The signature is the same one from the Thursday Next postcard

The impressions are unnumbered, and without limit.
First used: It hasn't. Not Yet. Be the first and get a 'First stamp' stamp to match your birthday stamp...