Vintage Business / Credit Card Holder with Box

This is a mother-of-pearl business card or credit card holder, mounted in a silver-tone metal case. What you’re seeing: • The shimmering surface is natural mother-of-pearl, not plastic with hand-brushed calligraphy in black ink in the front. • The text “藏書閣 (Jangseogak)” refers to the Jangseogak Archives, a prestigious Korean royal archive • The Korean text on the inner lid indicates it was issued or commissioned rather than mass-market retail.