Additional Markings
- Back Stamp - A pin's back stamp contains information about the pin and can include copyright information and edition size.
- Artist Proof - Artist Proof pins (or AP pins) are created during a manufacturing run to verify quality. AP pins have a small AP stamped on their back. Some collectors value the AP markings, but most AP pins have minimal difference in secondary value because the markings are not normally visible.
Read more about this topic: Lapel Pin
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