HONG KONG — Hong Kong’s famous neon signs are becoming harder and harder to find.

The once-ubiquitous signs advertising bakeries, restaurants, pawn shops and more became a symbol of Hong Kong as it transformed into an international financial center in the decades after World War II. They provided the backdrop in films such as “Blade Runner” and local director Wong Kar-wai’s “In the Mood for Love,” and drawing tourists from all over the world.

“So many memories and so many…