Jewelry Metal Stamp

How do you hand-stamp letters into metal (for jewelry)?
What supplies/equipment would I need? Here’s an example:
http://images.etsy.com/all_images/a/a97/44a/il_fullxfull.16345042.jpg
Thanks!
There are “stampers” that you have to purchase that the letters can be changed and work like pliers.
Metal Stamping Demo – RomaZone.com
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