It is a popular playing cards design!
To the ace of the heart, it is a skull mark!
"Oxidized silver processing" which carves a pattern by etching (corrosion processing) and oxidizes the indented portion black.
[Processing] Silver plating, Oxidization finish, Etching
[Accessories] Zippo company's Guarantee, Zippo gift box
Genuine Japanese Zippo Lighter
Made in the USA and finished in Japan