S.W.A.L.K.

Royal Mail will release a new Valentine’s retail stamp book on Jan. 15 to help retailers boost stamp sales and enable their customers to post special loving greetings on Valentine’s Day.

The new stamp book contains four 1st Class Stamps and two stickers bearing the Valentine’s messages, “Be My Valentine” and “SWALK."

"SWALK" is an acronymn for "Sealed With a Loving Kiss."

According to Wikipedia, WWII Postal Acronyms were used during the 2nd World War.to convey messages between servicemen and their sweethearts back home, hidden within regular letters.

Others included...

MALAYA - My Ardent Lips Await Your Arrival
HOLLAND - Hope Our Love Lasts And Never Dies
ITALY - I'm Thinking About Loving You or I Trust And Love You
BOLTOP - Better On Lips Than On Paper

Today these are sometimes used in online chats, Instant Messages, e-mails, blogs, or newsgroup postings.