Old stamp
A postage stamp from another era — a small printed object whose value lies in what it once paid for.
An old stamp in a dream is the dream's image of a small printed object whose value now lies in what it once paid for. The stamp's monetary face is obsolete; what survives is the design and the memory of letters it carried. The dream brings the old stamp when something in your life — an expired credential, a defunct institution, a piece of correspondence from a former phase — still carries meaning by virtue of the journey it made when it was current. An old stamp kept in an album with the date noted is the dream affirming the careful preservation. An old stamp found stuck to the back of an envelope nobody is going to open is the dream noting that the carried message has been forgotten, and the stamp survives without the letter it was put on to deliver.