Maxey’s Singapore Spa was in Los Angeles, California at 119 South Fairfax, and it opened in 1936. A history of the restaurant is here. Below are the portraits by Wylog Fong on the menu cover and matchbook covers (front, front rotated, and back which may be his art).
In 2013 the International Auction Gallery, in Anaheim, California, auctioned some Wylog Fong bamboo oil paintings, all undated, including the one below.
The portrait on the napkin, in the article, is the same as the matchbook cover below. I’m not sure Wylog Fong did the art.